I've heard this about your hands + guns = not good. Course, it doubly explains why professional assassins wear gloves. Not only leaves no fingerprints, but minimises hurt to the precious firearms.

OH GOD, BAD THOUGHT: gun oil used as lube. PLEASE NO.

NUUUUU!!!! *flails*

Okay, I'm adding that to the list of things that Should Not Be but I don't think LKH will ever write. Right after zombie!sex.