Mixed Metaphors

We'll burn that bridge when we get to it.
We need to lower the playing field.
I wouldn't do that for a ten foot pole.
I wouldn't touch that with a million dollars.
He's a little green behind the ears.
We've just begun to scratch the iceberg.
I don't mean to be chasing a dead horse.
If you do that you'll open a whole ball of wax.
Everyone here is on the seat of his pants! [CNN reporter during the Florida presidental election fiasco]
That just tickled the pink out of me [with thanks to Joan Solheim].
I don't mean to throw a monkey into the wrench.  [radio talk show host]
I don't mean to step on anyone's sacred cow … [radio preacher]
He was running around like a chicken with its legs cut off.
You don't have to be a rocket surgeon to figure that out.