At last nights vernissage Mr. P and I walked around the gallery just after the show opened and checked out all the art work.  On our second pass around Mr. P noticed that someone had placed a red sticker on my tag.
Mr. P.: "Why is there a red sticker on your tag?"
Me:  "That means it sold."
Mr. P:  ".....no, really.  Why is there a red sticker on your tag?"
Me:  "Because it sold."
Mr. P.  "Are any of your relatives here?"
Me:  "It wouldn't surprise me, but that would just be depressing."
I can save face and say that it did get snapped up right away by someone that was not a relative and that I didn't know, who "never buys art" but just loved the work.