We’ve seen Caduceus’ mischievous side come out around his family... he’s older now, but he’s still pretty low on the family tree. Someone, either one of his parents or an older sibling, bends Caduceus over their knee in front of all his new friends.

Bonuses
+Caduceus goes from incredulous and snarky to sniffling and apologetic
++One or more of the Nein (maybe including Caduceus) is turned on by Caduceus’ punishment
+++Whoever’s administering the punishment talking to or involving the others in some way