Roger, I don't know if you recall a Beau Peep strip in which Beau and Dennis are walking through the desert and Dennis is hiding behind a twig, camouflaged as a tree. "Come on! If I hadn't sneezed, would you have known I was here!"
At the end of the strip, Beau tells Dennis to ditch the twig before the sergeant sees him, but Dennis refuses.
When they arrive back at the fort, Sergeant Bidet says, "Good to see you, Beau. What happened to Dennis? Was he captured?" And Dennis is grinning.
Is this the only time you decided to have the Sergeant (or another character) act out of character to get a laugh?