Thankfully nothing really embarasses me anymore I keep my shame in a small jar along with my dignity and morals.
But at uni I've started this habit (and got others to start) of saying bum-sex after I knock on people's doors.
One of my friends had just come back after visiting her parents for the weekend, I went to her room, yelled b**-s** and her parents opened the door
I think I was more embarrassed for her than myself, but it got worse 'cause I did it again while she was on the phone to her Dad