AA
KK
AK suited
QQ
AK offsuit

I have never layed these hands down preflop under any circumstances and I don't think I ever will, even if I was being pushed all in. If they are pushing and it comes to a coin flip and I lose, then so be it. I have my doubts sometimes with AK and QQ but still, I was never able to lay these down.

However, something tells me that this is a bad idea in some circumstances - I dunno. What do you guys think?