idk whether its the most embarassing situation but one of. I lived in a share flat, and at night ventured from the shower naked as i had left the towel in my room. so im walking naked in the corridor in darkness and missing the entrance to my room and entering not my room. there is a girl and her bf visiting already to bed.
 I enter, and look around bewildered (was bit tipsy) and understand i didnt have a telly.
then i notice them lying in the bed and they werent asleep.its darkish. but i notice them staring quietly.
Im thinkning wow much surprise many shame and leaving the room naked in total silence.

The following day meet them in the morning in the kitchen and the girl mentions that they were totally shocked. It was another pang of shame coming lol.