Witches and Underwear

Alright, listen up, you brainless goof. You asked about this 'joke' you found? Let me break it down for ya. You think witches actually fly on brooms? You think they go zooming around like some kind of vacuum cleaner? Nah, it's all make-believe, bud. The joke plays on the fact that 'grip' has two meanings: holding onto something, and also the underwear area. It is a pun, you see. You think too hard.