The Muzio Gambit is one of the most aggressive lines in the already aggressive King's Gambit.
Instead of counter attacking with the knight on f3, white gives that knight up in exchange for a massive attack with his bishop, queen and castled king. Black is up in material but has a weakened king side and no developed pieces.
1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Nc6 5. d4 Na5 6. Bxf7+
Kxf7 7. Ne5+ Kf6 8. Qh5 Nh6 9. O-O Ke6 10. d5+ Kxe5 11. Bxf4+
Kd4 12. Qd1+ Kc5 13. b4+ Kb6 14. bxa5+ Ka6 15. Qd3+ b5
16. axb6+ Kb7 17. bxc7 Bc5+ 18. Kh1 Qf6 19. d6 1-0