I decided that I wanted to be a voice on every animated cartoon in the history of the world - even shows that haven't been on the air for a very long time, that's going to be harder to pull off.
In fact, when I come up with an idea for a parody I try to resist the urge to Google the idea to see if someone has done it already because the answer is almost always, "Yes, of course they have, they've thought of it!"