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 "Paris"] [Date "????.??.??"] [Round "?"] [White "Kieseritzky"] [Black "Dumoncxeau"] [Result "1-0"] [BlackElo "0"] [FEN "2kr1b1r/pp6/2n1P1p1/3N3p/2BP1BP1/3K1Q2/PPP5/6qn w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Nb6+ axb6 2. Qxc6+ bxc6 3. Ba6# 1-0