Hillbilly Period

Alright, listen up, buttercup. This joke is about a hillbilly family, and it's real simple, even for you. The hillbilly momma knows her daughter is menstruating because her son, who's been gettin' a little too friendly with his sister, can taste the blood. I know you like this kind of stuff because your family tree doesn't fork, and you have a banjo on your knee.