i realyl love the concept of the boys' antics reaching the wrong target.... like, captain gets hit with the "pea baby food disguised as guacamole" prank instead of krupp. or krupp gets the cupcake they were saving for captain
i imagine that cap would just kind of… take a lot of pranks in stride (he’d probably just eat the baby food and think that the guac batch was off if anything). his sidekicks are having a bit of fun!
unless said prank was extremely dangerous (in either execution or preparation) to worry him, or crosses the line to the point where it upsets him
slime would probably be a safe bet
(meanwhile krupp would just eat a piece of the cupcake and just save it in his sad, sad fridge for later)