I was really pleased with this one. Sometimes I think I am at my best when I use a “reveal” type of punchline… where the reader is not supposed to know what is going on until the final panel. Some crucial detail is revealed which throws the whole thing into a new and (hopefully) funny light. Then you go back and read it again in context.
That might sound like an easy way to write a gag, but it’s one of the toughest I’ve tried. People are very hard to surprise, and with a reveal, you’re hanging everything on the successful attempt to catch them off-guard. If the joke pancakes, it’s going to hit hard.