In The Kissing Booth 2 (2020), Elle and Lee asks Marco to be kisser at the kissing booth:
Elle: It's the most popular booth! And it's for charity. Don't you believe in charity?
Marco: I'm standing here talking to you.
Lee: Hey! Whoo-hoo-hoo! That was a good... one.
(Lee high fives with Marco)
What's the joke in Lee's words?