Taking Matters

If you want something done, you have to do it yourself. In other words, there comes a time in a story when the villain decides enough is enough and it's time for him to take matters into his own hands and carry out his evil plan himself. This usually happens under these circumstances: This can lead to a villainous breakdown, crossing the Moral Event Horizon, and/or the final showdown with the hero.
 * The villain is running out of time and/or reaching his/her deadline
 * His minions fail to carry out his plans
 * His army is defeated in battle
 * He discovers an opportunity
 * The villain's plans (usually constantly) fail
 * The villain reaches his breaking point

Noteworthy examples

 * Queen Narissa decides to poison Giselle herself after Nathaniel fails to carry out her plan.
 * After Ronan the Accuser is defeated and his plans fail, Thanos decides to obtain the Infinity Stones himself.
 * Thrax takes matters into his own hands when his deadline is approaching to kill Frank.
 * The Wicked Queen decides to take matters into her own hands and kill Snow White himself when the Huntsman defies her and brings back the heart of a pig instead.
 * After realizing that Cady Heron gave her a weight loss bar, Regina George decides to get her revenge and turn the school against each other herself.
 * Ursula takes matters into her own hands and prevent Ariel's romance with Eric when the third day - the day Ariel has to kiss Eric - approaches.
 * Governor Ratcliffe makes his decision to kill Chief Powhatan himself when the colonists defy him.
 * After noticing that Ofelia has made off with his newborn son, Captain Vidal decides to go after the girl and kill her himself.
 * After his henchmen are overpowered by Gutsy and his force, General von Talon decides to go after Valiant himself.

Quotes
"I've been tricked! (The Queen furiously storms downstairs into the dungeon and enters the door leading to her laboratory) The heart of a pig! The blundering fool! (tosses the box meant to contain Snow White's heart to the floor) I'll go myself to the Dwarfs' cottage in a disguise so complete, NO ONE will ever suspect. (reaches into her bookshelf and pulls out the one that says "Disguises") Now, a formula to transform my beauty into ugliness. Change my queenly raiment to a peddler's cloak. (finds the 'Peddler's Disguise' formula in her book) "Mummy dust, to make me old. To shroud my clothes, the black of night." (pours a black substance into a goblet of water, and the water turns pitch black) "To age my voice, an old hag's cackle." (turns on keg and a hag's cackle is heard as it pours more contents into the goblet).  To whiten my hair, a scream of fright. (turns on keg and a ghostly image comes out and shrieks in terror). A blast of wind, to fan my hate! (Wind blows fiercely into the laboratory) A thunderbolt...(crack of thunder strikes on cue)... to mix it well.  Now... begin thy magic spell. (The Queen slowly drinks from the goblet, swallowing her potion. Suddenly, she begins to writhe, clutching her throat. Her hair becomes long and white) Oh, no! Look! My hands! (Her hands become wrinkly, bony and hideous.) (In the shadows...) My voice! My voice! (Cackles!) A perfect disguise! (reveals herself as a hideous, old, Witch. Her terrified pet raven hides in the skull it was a perched on). And now...a special sort of death for one so fair. What shall it be?....AH! A poisoned apple. Sleeping death! (Reads from the book) "One taste of the Poisoned Apple, and the victim's eyes will close forever...in the sleeping death!...." (Grins wickedly)"

- The Wicked Queen taking matters into her own hands after her huntsman fails to kill Snow White. "(Queen Narissa is furious with Nathaniel.) YOU IDIOT! (Nathaniel: But Your Majesty - ) I sent you to KILL her, not SAVE her. Can't you get that straight? (Nathaniel: I - I realize you're upset, madame. But if you could find me one way to give me one more chance...) Another chance?! You think poison apples grow on trees? There's only one left. You are OUT of chances! (Nathaniel: But Your Majesty - !) FORGET IT! I'M coming here! AND I WILL KILL THE LITTLE WRETCH MYSELF!!! (Nathaniel: Oh, pooh.) (Narissa's shriek shatters every glass bottle and cup on the kitchen counter.)"

- Queen Narissa berating Nathaniel for letting Giselle escape and making her decision to poison her herself. "(On the Ingrown Toenail, Thrax and his thugs are listening to the radio. He pulls off the curtains and laughs with evil glee.) (Bruiser: What's so funny?) (Joe Cramp: I don't know.) They're making this too easy! (Thrax continues to laugh.) You know, in all of the bodies I've been in, no one has ever gotten wise to me and now for the first time, an immunity cell has figured out everything and they don't believe him! (Bruiser and Joe Cramp laugh.) Can you taste the irony in that? (Thrax's men continue to chortle.) Shut up! What are you two laughing at? Alright, we're back on schedule. (Thrax begins to gather pollen pods and place them in his coat.) (Bruiser: But boss, we're the only ones left. Maybe we should incubate for a while? (Thrax's eyes narrow and he points his red-hot claw at Bruiser's eye.) YOU incubate. I said forty-eight hours, I'm gonna make my deadline. (Bruiser whimpers like a frightened child and Thrax burns down his hideout, killing his thugs in the process.) Medical books aren't written about losers!"

- Thrax taking matters into his own hands and setting out to make his deadline. "(Laughing, Flotsam and Jetsam congratulate each other for tipping Ariel and Eric's boat.) Nice work, boys. That was a close one. TOO close. The little tramp! Ah, she's better than I thought. (Fuming, Ursula swims over to her cabinet of potions and angrily knocks many of them down with a crash.) At this rate, he'll be kissing her by sunset for sure! Well, it's time Ursula took matters into her OWN tentacles! (Ursula tosses magic potion into her cauldron and places an orb with a butterfly inside into it.) Triton's daughter will be mine! And then I'll make him writhe. I'll see him WRIGGLE LIKE A WORM ON A HOOK! (She laughs maliciously as she transforms herself into a beautiful girl.)"

- Ursula taking matters into her own hands when she's running out of time and must keep Ariel from falling in love with Eric. "Fine. I'll do it myself."

- Thanos taking matters into his own hands and deciding to find the Infinity Stones himself.