Friend of mine brought off this semi-well known trap in a league game: 1.d4 d5 2.c4 e5 (his favourite Albin counter gambit) 3.dxe5 d4 4. e3 Bb4+ 5. Bd2 dxe3 6. Bxb4? exf2+ 7. Ke2 fxg1=N+ and it can't be taken because of Bg4+ so after 8.Ke1 Qxd1+ ...Nc6 and ...Bg4+ he actually got that third knight out and was a piece up...hope I got that right, don't have a board in front of me.
Bad joke with a third Knight.
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This is not serious, just thought it's a little amusing....