Son of a Gun

Somebody once called me a son of a gun.  I told him that I thought he was rather confused, as guns aren't able to reproduce since A) they don't have genitals, 2) they aren't organisms and III) even if the previous two facts weren't true, they would most likely kill all their offspring anyway.  One black eye later, I learned the valuable lesson that an F in biology combined with an NRA membership is a dangerous combination.