When two heterosexual men share a bed (probably out of necessity) and one accidentally rubs the other man's back with his beard - causing sudden anxiety in both parties

when hair runs from the lower back down the crack of your ass

Hair that runs from the side burns to the back of the neck.

When you are a a bar or event and after shooting liquor, you realize that you did not wash your face from the prior night cunnilingus on a female.