Mixed Metaphors.

If you're not going to grab the bull by the horns while the iron is in the fire, then get off the pot.

I ran across this beautiful blend of several metaphors years ago in something I read--Dave Barry, probably, or someone similar. I pull it out every now and again when such a sentence is needed, i.e., not very often.

However, I heard a new one this week, and I was blown away by how seamlessly it made it into conversation. I was at L'Afro's while she was being home taught, and the home teacher busted it out, apparently on the fly:

Sometimes you have to turn the other cheek, walk two miles, and give him your coat.

It had to be premeditated. There's no way to do that on the fly. Wow.