My mum's tutoring some person in the kitchen.
I didn't think to knock when I saw the door shut, so just walked in, and was about to start having food when I turned round and saw my mum and her student staring at me open mouthed.
Rather hastily apologised and walked out.
Not really embarrassing y'would think. The fact that I had just had a bath, and was only wearing a VERY small towel to cover my crotch (it doesn't cover my ass, only cover both cheeks, not my actual hole) makes it slightly worse.
Oh dear