Possibly the best come-back ever!
A divorced man meets his ex-wife's new husband at a party.
Later after knocking back a few drinks,
he goes over to the new guy with a smug look on his face and asks him
(in a voice louder than necessary):
'So ... how do you like using second hand stuff?'The new husband replies
(also in a voice louder than necessary):
'It isn't that bad. Past the first 3 inches, it's all brand new.