Yeah, I can do the finger tapping thing also. I play piano, so maybe that has something to do with it?
One hand is much easier to do, though...
I can also do the Spock Vulcan hand sign, and then move the fingers sideways to the two in the middle touching, with the pinky and pointer out alone.
Extra freaky fun-
have left hand do Spock hand, while right hand does the switch, and jsut keep them moving opposite. Apparently that is really hard to do for some.l ll l
and then switch to ll ll
Left Hand Right Hand ll ll
and then switch to l ll l
simultaneously, straight up, no bending or curving of fingers.
the thumb can join in, or not...