Vietcong Tree Powers

Alright, listen up, you cotton-headed ninny muggins! This joke is all about the Vietcong, who were like, super sneaky guerilla fighters during the Vietnam War. The punchline 'tReE pOwErS aCtIvAtE' is saying that the Vietcong were hidden in the trees, ready to ambush the American soldiers when they landed on the beaches. Get it? You probably don't, because you still think the Earth is flat.