No particularly interesting "getting caught" stories, except perhaps for when my wife found my diaper stash. That ended well, so it's boring.
Outside of that, most of my stories fall into the "almost caught" category. The most harrowing of these was probably when I was 10 or 11 years old and trying to diaper myself before going to bed. By that time, it was actually a pretty routine thing for me; I'd long since discovered the box containing my sisters and my old cloth diapers, and while I couldn't easily use them for their intended purpose (think laundry), I still loved being padded. Sooooo...
Basically, I'd laid out a stack of these diapers on the floor next to my bed, laid myself down on this diaper-stack, and was just about done with the pinning when my bedroom door flew open. Creaking floorboards usually gave me notice of an approaching parent, but not that time, for some odd reason. So anyway, there's Mom, and I pretty much back-flipped off the floor and into bed in less than second. Mom was sufficiently dazzled by this that she apparently didn't notice my half-diapered butt as it streaked past. That, and she obviously had another agenda, as she proceeded to lecture me about homework or something else I hadn't done. Of course, all I could do was think, "Please, PLEASE don't ask me to get out of bed!!" And she didn't. Nearest miss I ever had. (And probably the closest to a heart attack I've ever been!)