when a male and female are having bum sex and the man pulls out to swap to the vagina but 'accidentaly' he misses and sends his jism up the girls chest. as the girl stands up in shock the male 'accidentaly' head butts her in the back of the head.
Male. "sorry about the skrunting last night i swear it was an accident"
Female. "yeah just like it was a accident the other ten times"