If this has already been covered will someone please link me to it. If not does anyone know? Also I heard that if you cross your fingers on both hands (two pair) it crosses each other out. Hmm…
In fact, this will be a Mailbag Answer, probably in a few weeks.
But Qeelocke wants an answer now! 
I’ll guess. Sign of the cross. Crossing fingers is saying a prayer.
So you can frighten vampires away by crossing your fingers? That NEVER worked for me.
Ukulele Ike, it helps if when crossing your fingers you also point to another potential victim with rosy cheeks and iron-rich blood coursing through their veins. (Someone like you, in fact, since with all those lamb cutlets you’ve been eating your blood is probably nice and juicy.)