23rd Oct: It's time for the Second TV Tropes Halloween Avatar Contest! Details here
i do not think the prudent one hastes to initiate
a sequence of events which he lacks power to terminate
— archy, prudence
"We increased the sharks' brain mass, and as a side effect, the sharks got smarter."
"So the good news is, Godzilla's back. The bad news is, Godzilla's back."
Ares: I was trying... to make you... a great warrior!
Kratos: You succeeded. [stabs Ares]
Twilight Sparkle: When other unicorns' spells go wrong they fail horribly. But noooo, for me they go wrong by working even better than I ever needed... or wanted.
"Someone near him said: 'It worked.'"
"Someone else said: 'Now we are all sons of bitches.'"
— Kenneth Bainbridge, on the Trinity atomic bomb.
"Our resurrection spell worked like a magic charm. We brought you back to life, Buffy. Right where we left her."
—Xander Harris, Buffy the Vampire Slayer
"But it was only when they finished Project Satan that they realized they made a terrible mistake! For you see... it was pure evil."
—Futurama, Calculon on an attempt to create the most evil car in the world.
"Your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
— Dr. Ian Malcolm, Jurassic Park
"The stunt that went horribly right."
"If this substance falls into the wrong hands, half the world population might die!"
"And if it falls into the right hands, is it the whole population then?"
—"Hunt for a Pirahna"
"A lesson for all you budding mad scientists out there. It's an old lesson, but one that bears repeating. When you set out to build an unstoppable killing machine, please, ladies and gentlemen, make certain you really really want an unstoppable killing machine first."
—Artie, "A Brief Moment of Culture", Narbonic fanfic
Shepard: I met your creators. They told me what you did to them.
Catalyst: We did as we were expected.
Catalyst: When they asked that I solve the problem of conflict, they failed to understand they were part of the problem themselves. The flaws of their organic reasoning could not perceive this. They lacked the foresight to understand their destruction was part of the very solution they required.
"In the city, science was unstoppable, until one day, science couldn't be stopped."
— BioShock 2 trailer
"His mind whirled with great plans, never thinking of what might happen if he were to succeed"
You fought a war to destroy the Jedi. Congratulations on your success