There really isn't a joke in the dialogue. Bobby's just bragging about his new "invention". It was just a setup for him to be embarrassed once he realizes that there is a girl in the room (this is supposed to be the 1st time he's meeting Jean Grey).
Got it. I had only seen these panels out of context. Since that introduction could also work as some kind of joke I did not realize it was an actual introduction to Jean.
Comments
About the first sequence here, I get what the joke would be in the drawings, but I am not sure if the dialogue is part of it, too.
Anyone care to explain any joke in the text, if it is present?