Dick Brain: Grand Prix is the case of 2.f4 which has the same ECO code.
The interesting thing about this blunder is that you may not have to wait your whole life until somebody may or may not play a Smith-Morra gambit against you. This same scenario can result from classical queen pawn games:
1. d5 d5 2. c4 e6 3. nc3 dxc4 4. e3 c5 5. Nf3 Nf6 6. bxc4 a6 7. 00 Nc6 8. Qe2 Bb7 9. Bb3 Bb7 10. Rd1 Qc7 11. dxc5 Bxc5 12. e4 Ng5 13. Rf1? Nd4
Engvoldsen Madsen Copenhagen 1938
(and in many other games)
Or in the Trompovsky attack:
1. d4 Nf6 2. Nc3 c5 3. e4 cxd4 4. Qxd4 Nc6 5. Qd1 e6 6. Nf3 Qc7 7. a3 a6 8. Bd3 Bc5 9. Qe2 Ng4 10. 00 Nd4
Barrios / Santa Torres Elista olm 1998