Quotes / It's Been Done

You have disappointed me, Trunks. You told me you'd show your special power, but all you did was pump up your muscles, and there is nothing special about that.
Perfect Cell, Dragon Ball Z

Eh, it's been done.

If you're looking to cash in on the next big idea, the smart money is that it was already written about in a Donald Duck comic.

Oh, you have got to be kidding, sir. First you think of an idea that has already been done, and then you give it a title that nobody could possibly like! Didn't you think this...
[Fade to:]
... the best-seller list for eighteen months! Every magazine cover had...
[Fade to:]
... most popular movies of all time, sir! What were you thinking?
[beat]
I mean, thank you, come again.
Apu Nahasapeemapetilon, The Simpsons

Cooler: Now, what say you?
Piccolo: Frieza did it.
Cooler: Excuse you?
Krilin: The robot thing. Frieza did it. When he came back to Earth.
Cooler: But that's not the same-
Piccolo: After he took over Namek, like you are now.
Cooler: Wait! He destroyed Namek!
Gohan: Well this is new Namek.
Cooler: So it's completely different!
Piccolo: Yeah, about as different as you are from Frieza.
Krilin: SHOTS FIRED!
Cooler: ... Kill the bald one.
Krilin: Frieza did it!
Dragon Ball Z Abridged, Cooler 2: The Return of Cooler's Revenge: The Reckoning
http://tvtropes.org/pmwiki/pmwiki.php/Quotes/ItsBeenDone