No, that's "bad dad joke humor". My father would do that sometimes if the waitress said they'd respond to weird names and would laugh like it was the funniest joke in the world every time. I'm sure it got old fast, but he always tipped well so I think they didn't mind in the end. My guess is this guy is the same and thought it was hilarious so he wanted to give her a great tip, and the wife got super jealous.