You may have heard of the classical bishop sacrifice on h7. Here is another brilliant attack, the double ! bishop sacrifice.
[Event "?"] [Site "Amsterdam"] [Date "1889"] [Round "?"]
[White "Lasker"] [Black "Bauer"] [Result "1-0"] 1.f4 d5 2.e3 Nf6 3.b3 e6 4.Bb2 Be7 5.Bd3 b6 6.Nc3 Bb7 7.Nf3 Nbd7 8.O-O O-O 9. Ne2 c5 10.Ng3 Qc7 11.Ne5 Nxe5 12.Bxe5 Qc6 13.Qe2 a6 14.Nh5 Nxh5 15.Bxh7+ Kxh7 16.Qxh5+ Kg8 17.Bxg7 Kxg7 18.Qg4+ Kh7 19.Rf3 e5 20.Rh3+ Qh6 21.Rxh6+ Kxh6 22.Qd7 Bf6 23.Qxb7 Kg7 24.Rf1 Rab8 25.Qd7 Rfd8 26.Qg4+ Kf8 27.fxe5 Bg7 28.e6 Rb7 29.Qg6 f6 30.Rxf6+ Bxf6 31.Qxf6+ Ke8 32.Qh8+ Ke7 33.Qg7+ 1-0