You never know when you'll have a bad idea for a worse joke.
It's not the bad ideas that do you in, but the good ones.
You can never discard too many bad ideas.
Even a bad idea executed is better than a good idea undone.
The only bad ideas are the ones never tried.
All of our days are numbered. We cannot afford to be idle. To act on a bad idea is better than to not act at all, because the worth of an idea never becomes apparent until you do it.
The survival value of intelligence is that it allows us to extinct a bad idea, before the idea extincts us.
All good ideas start out as bad ideas, that's why it takes so long.
I got some bad ideas in my head.