A good sacrifice is one that is not necessarily sound but leaves your opponent dazed and confused.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown100"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r5k1/pp5p/2pNn1p1/3r4/8/8/PPP2PP1/3R1RK1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Nd4 2. Rfe1 { To prevent the deadly Ne2+ followed by Rh5#. } 2... Rxd6 3. c3 Nf5 4. g4 Rad8 5. Rxd6 Nxd6 6. Re7 h6 { Black wins with a large material advantage. } 0-1