A good sacrifice is one that is not necessarily sound but leaves your opponent dazed and confused.
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[Event "World's Fair"]
[Site "Paris"]
[Date "1867.??.??"]
[Round "?"]
[White "Celso Golmayo Zupide"]
[Black "Wilhelm Steinitz"]
[Result "0-1"]
[BlackElo "0"]
[FEN "rnb3qr/p1ppk2B/1p2pp2/8/3P4/5Q1N/PPP3PP/R3K2R b KQ - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qxh7 2. Qxa8 Nc6 { Trapping the white Queen. } 3. O-O-O Ba6 4. Qxh8 Qxh8 { Black has a winning material advantage. } 0-1