In its starkest form, The Sneak looks like this:
I know what you're thinking: nobody would fall for that, letting the Bishop get trapped.
It is true, not everybody does fall for it. Here are some warnings, though:
1.e4 e5 2.Nf3
2.Bc4 Nf6 3.Bxf7+ Kxf7 4.d3 Nc6 5.c3 Bc5 6.a4 d6 7.Nf3 Ng4 8.0-0 Rf8 9.b4 Bxf2+ 10.Rxf2 Nxf2 11.Kxf2, Viejoasquerosos - BigJase, redhotpawn, 2006 (1-0, 40)
2...Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7
4...Kf8 5.Bxg8 Rxg8 6.c3 Qf6 7.d3 d6 8.a4 Ke8 9.Bg5 Qg6 10.h4 h6 11.h5 Qe6 12.Bd2 Bd7 13.b4 Bxf2+ 14.Kxf2, SIRMO - AAlekhine, chessworld, 2007 (1-0, 47)
5.d3
5.c3 d6 ( 5...Nf6 6.d3 h6 7.0-0 g5 8.Qb3+ Ke8 9.Kh1 g4 10.Ng1 h5 11.Bg5 Rh7 12.Bxf6 Qxf6 13.Qg8+ Qf8 14.Qxh7 g3 15.Qg6+ Qf7 16.Qxg3 d6 17.a4 Be6 18.b4 Nxb4 19.cxb4 Bxb4 Piratepaul - DREWBEAR 63, JGTourney4, ChessWorld, 2009 (1-0, 26)) 6.d3 Nf6 ( 6...Bg4 7.Ng5+ Kf8 8.Qxg4 Qe7 9.Ne6+ Ke8 10.Nxg7+ Kf7 11.Nf5 Qf6 12.Bg5 Qe6 13.a4 Nf6 14.Bxf6 Qxf6 15.b4 Bb6 16.a5 Bxf2+ 17.Kxf2, Piratepaul - metalwarrior1969, JGTourney4, ChessWorld, 2009 (1-0, 36)) 7.Bg5 Bg4 8.h3 Bh5 9.g4 Bg6 10.Nbd2 h6 11.Bh4 Qd7 12.a4 h5 13.b4 Bxf2+ 14.Bxf2, Piratepaul - blackburne, chessworld, 2008 (0-1, 22);
5.0-0 Nf6 6.d3 Rf8 7.Nc3 Kg8 8.Ne2 d6 9.a4 Be6 10.c3 h6 11.b4 Bxf2+ 12.Rxf2 Ng4 13.Rf1 Black Puma - Sir Osis of the Liver, JGTourney4, ChessWorld, 2009 (1-0,35)
5...Nf6
[ 5...h6 6.c3 ( 6.0-0 g5 7.h3 Nf6 8.a4 d6 9.c3 g4 10.hxg4 Bxg4 11.b4 Bxf2+ 12.Rxf2 Black Puma - DREWBEAR 63, JGTourney4, ChessWorld, 2009 (1-0, 21)) 6...d6 7.0-0 ( 7.a4 Bg4 ( 7...Qf6 8.b4 Bxf2+ 9.Kxf2, SIRMO - Ratscales, chessworld, 2008 (1-0, 36)) 8.b4 Bxf3 9.Qxf3+ Qf6 10.Qxf6+ Nxf6 11.bxc5 dxc5, braken - willitfw, chessworld, 2008 (1-0, 51)) 7...Nf6 8.a4 Na5 ( 8...Bg4 9.b4 Nxb4 ( 9...Bxb4 10.cxb4, Piratepaul - calchess10, JGTourney4, ChessWorld, 2009 (1-0, 44)) 10.cxb4 Bd4 11.Ra2 a6 ( 11...Nh5 Piratepaul - TWODOGS, JGTourney4, ChessWorld 2009 (1-0, 32)) 12.Nbd2 Nh5, Piratepaul - eddie43, chessworld, 2008 (0-1, 56)) 9.b4 Bb6 10.bxa5 Bxa5, braken - eddie43, chessworld, 2008 (1-0, 23)
6.Bg5
6.a4 Rf8 7.c3 d6 8.0-0 Kg8 9.Ng5 ( 9.b4 Nxb4 10.cxb4 Bxb4 11.Qb3+ Kh8 12.Qxb4 0-1 Black Puma - stampyshortlegs, JGTourney4, ChessWorld, 2009 (0-1, 24)) 9...Bg4 10.Qe1 Nh5 11.h3 Bxh3 12.Nxh3 Ng3 13.b4 Nxb4 14.cxb4 Bd4 15.Ra2 Nxf1 16.Kxf1, SIRMO - manago, chessworld, 2008 (1-0, 18)
6...Rf8 7.0-0 Kg8 8.c3 Qe8 9.Kh1 d6 10.a4 Bg4 11.b4 Qh5 12.Bd2 d5 13.bxc5 dxe4 14.dxe4 Nxe4 Piratepaul - delboy138, chessworld, 2008 (1-0,17)