As to 'Three on a match'... It is a valid superstition on the battlefield. The versions I hear request that it be no more than two, as by the time the third person lights, there was a substantial chance that the 'enemy' would be able to spot the flame at night.

Something that is dying out, but in the Navy a lot of people are very nervous about anything to do with shipwrecks... like attracting like and all...

M