I've only ever laid down KK once.

That was in Pacific 25NL, where two short stacks both went all-in.

I called (About 1/3 of my stack), and a guy with about $50 went all in.

I thought about it for a bit, and folded.

Turned out I was up against 77, QQ, and AA from the large stack.

He got his payday, and I'm glad I didn't contribute to too much of it.