The following position is from an OTB blitz game that I just played against a friend.  We play lots of games where we fool around and do piece sacs -- our reason usually being "because it looks cool".  This game started as a Tal gambit that I turned into a reverse Budapest (1.e4 c5 2.f4 d5 3.Nf3 dxe4 4.Ng5 f5).  Later on I turned down winning the exchange on at least three different occasions, amid remarks of "d...bag", simply because...well...I could.  Anyway, about 10 minutes after we had both run out of time (nobody cared), the position got so crazy that I just had to take a snapshot of it:

After we analyzed it inconclusively, I told him that I hadn't found a direct win if he simply promoted the pawn.  So he tried it.  Although I soon won his first queen, he still had enough of a material advantage to beat me in the endgame 30 moves later.  /*Spoiler:  Fritz tells me now that after ...b1 = Q I have several ways to deliver perpetual check, but it also says that ...Qc7+ and ...Bxf6 are wins for Black.*/