Picked up an excellent one the other day. Apparently Margaret Thatcher was hosting a dinner while she was PM and all the previous living PMs were in attendance. In the banter following dinner someone asked, given the company, just what was the collective noun describing such a gathering.
Harold MacMillan, quick as a flash, said: "A Lack of Principals"
Many years ago I watched a good natured hissy fit between two smart gay guys and after one had said something like "You're such a girl, such a queen such a slut" and a few more wonderfully descriptive words the other came back with, "Oh such a nonce of nouns!"