It is so much easier in a scary movie: you know that you are moving into danger when the background music becomes ominous, perhaps the screeching of violins...
In a chess game, especially when playing a dubious opening like the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) it is important to be aware of dangerous themes.
Darthnik - spenjch
blitz, FICS, 2011
1.e4 e5 2.Bc4 Nc6 3.Nf3 Bc5
Already we have some foreshadowing with 3...h6 4.d4 exd4 5.Bxf7+ Kxf7 6.e5 Qe8 7.Qd3 Nxe5 8.Qxd4 Nxf3+ 9.Kf1 Nxd4 White resigned, Benschatko - Lakritzl, FICS, 2006; and
3...Nf6 4.Nc3 Bc5 5.Bxf7+ Kxf7 6.Nxe5+ Nxe5 7.d4 Bxd4 8.Qxd4 d6 9.Bg5 h6 10.Bxf6 Qxf6 11.Nd5 Nf3+ White resigned, gjtlsdnr - silvalgo, FICS 2011.
4.Bxf7+
4...Kxf7 5.Nxe5+ Nxe5 6.d4 Bxd4 7.Qxd4 Qf6
Even here, the danger begins to appear: 7...d6 8.f4 Qh4+ 9.g3 Nf3+ White resigned, Cradle - Foom, FICS, 2008 and Bevs - LordLucika, FICS, 2009.
8.f4 Qh4+
Or simply 8...Nf3+ White resigned, as in ainafets - Papaflesas, FICS, 2007 and stemplarv - KIAUA, FICS, 2007; or further 9.gxf3 Qxd4 White resigned, yorgos - Kompete, FICS, 2009.
9.g3 Nf3+ White resigned
Danger is everywhere, and we must learn to recognize it.