It is hard to mention the chess wise guy Geoff Chandler without thinking about the following game that he posted, years ago, on his "Chandler Cornered" site
Anon - Anon
1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bf4 Be7 7.Nc3 Nf6 8.Nb5 Bb4+
Black played Bb4+ with the idea of playing Ba5 covering c7.
Whilst White was pondering on his next move Black suddenly stated:
"I thinks It's checkmate!"
And it was!!!
Before the start of the game neither player had noticed that the Black King and Queen were on the wrong squares.
(Okay, that was a Petroff Defense, not a Jerome Gambit. If you feel cheated, don't worry, I have you covered: check out Geoff's legendary "Mars Attacks!")