I think we are talking more about catch-phrases here, rather than one-liners.
In terms of one-liners here is my favorite, from the "Bet Your Life" show hosted by Groucho Marx:
One often-told story recounts the appearance of a female contestant who spoke in broken English, and who was clearly an easy mark for the quick-thinking Marx. In the course of the usual pre-game interview, Groucho was putting her at ease by asking questions about her life. The contestant offered that she had borne eleven children, to which Groucho remarked "Eleven children!" The contestant innocently replied "I love my husband," to which Groucho responded with the now famous "I love my cigar, but I take it out once in a while!"