It happens pretty often in the Muzio Gambit of the KGA (1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. 0-0), and the Bxf7 sac ushers in the Double Muzio Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. 0-0 gxf3 6. Qxf3 Qf6 7. e5 Qxe5 8. Bxf7+ Kxf7 9. d4 Qxd4+ 10. Be3 Qf6 11. Bxf4
The Muzio seems crazy at first, giving up a knight for a pawn, but white gets a very sizeable and dangerous lead in development. Look up some games on chessgames.com - I know Alexei Shirov has played it on occasion.
Does anyone know if there is a credible line in the KGA where white sacrifices his light square bishop to drive out the black king onto the weak F7 square? I've seen lines with the king's knight used as a sacrifce which places the black king in a bad place once white castles and has his rook on the now open c file but have not seen it done with the bishop. Thoughts?