Did he jump, or was he pushed?

My guess is that the first chessplayer to follow 1.e4 with Bc4 (either right away, as in the Bishop's Opening, or later, as in the Italian Game or the King's Gambit) already had the move Bxf7+ in mind. That seminal moment would have been long before the birth of the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) – and who knows which of those early attacks might have inspired Alonzo Wheeler Jerome to create his "Double Gambit"?

In the following game, Jerome Gambit Gemeinde member blackburne is playing the venerable King's Gambit Accepted, until the game takes a Bxf7+ swerve. Was blackburne's hand forced by the ghost of Lolli, Salvio, or Muzio, or of A.W. Jerome himself?

blackburne - notverydeepblue
ChessWorld, 2011

1.e4 e5 2.f4 exf4 3.Nf3 a6

I have found only 3 or 4 game examples of this move, all from amateur play. Black is either experimenting wildly, or he is essaying the weak psychological gambit: do you know your opening as White well enough to play it without any help from me??

Either way, knowing blackburne, this signals a short game.

4.Bc4 b5 5.Bxf7+

Of course, there was nothing preventing White from playing 5.Bb3 followed by 6.d4, instead – except, perhaps, his sense of adventure.

5...Kxf7 6.Ne5+ Ke6 7.d4

Does any reader care to wager that the next time blackburne reaches this position, he will offer a further piece with 7.O-O ?

7...c6 8.Qg4+ Kd6 9.Nf7+ Black resigned