This is a tough one because my most ideal embarrassing situations are Literally Impossible to play out IRL, given that I'm a very large adult man, and what I want to be is small and cute and helpless.

I think something I'd really like to do, that is achievable either IRL or in VR, is be placed into the child role and spoken to (and about) as though I'm a toddler by other adults present who are otherwise socializing with each other while I'm confined to either a playpen or toddler's play-yard. It's a very common thing for parents to keep their kid contained and in an observable space while they have adult conversations and only occasionally acknowledge that the kid is there, but it's a scenario that, in my experience, is almost never acted out or depicted in ab/dl media.

(note though that this fantasy falls apart for me the MOMENT there is a second 'child' added to the mix. the idea that I'm equal in status to anyone else present completely deflates any interest I have in a scene like this. Even in online RP, I find other babs who try to initiate some kind of 'making friends on the playground' scene with me to be really tiresome.)