My wife and I used to joke about going to the movies and wearing a depends so we wouldn't miss any of it, but that was like right after we were married, and she had no idea about my AB/DL side.
But recently, we were at dinner with a bunch of our car club friends at a Wendy's, and my wife said something about my not doing anything for a few months after my surgery so I'll heal properly. One of the guys that heard her said that she could tie me to the bed and put me in a depends. My wife was really embarrassed about it, but I didn't say anything. What's really weird about it though, is that he knows, or at least he did know, that I have to wear diapers anyway. We don't know if he was just trying to be funny, or if he was serious, but neither of us were going to ask him right there at the table with all the others sitting around us.
When I hear a diaper joke from someone else, I just laugh a little nervously at it and don't say anything.