DH here.
I've called both my kids "advertisements for fertility clinics" and "advertisements for birth control" depending on their actions.
I did a lot of name-based puns.
When I pat the younger one's back and I'll play the pie game (dunno if it has a name).
http://www.beaconlearningcenter.com/Lessons/Lesson.asp?ID=2050
(Did anyone else do that in elementary school music class? I just replaced the pie stuff with fussy baby stuff, like "cry", "fussy", "yell and scream", and "temper tantrum.")