The following are some good examples of how you might be embarrassed by being exposed when not expecting it.
#1) Finding out you're not flashing the person you thought you were is pretty humiliating
#2) Your wet shorts coming down while moving around and unintentionally mooning people on the boat nearby
#3) When your friend decides to check on your commando status by pulling your shorts down in public
#4) Your friends take a picture of you sleeping naked to let everyone check out your nice ass
#5) Almost the same as #4 but now your friend is naked too so maybe more was happening last night than just getting drunk
#6) More antics from your friends this time pulling on your underwear while you try to crawl away. Maybe you need new friends
#7) Getting caught toweling off after a shower swinging your shaved cock all around while a spy cam captures every move
#8) Being made to strip in public just to weigh in as if those little short shorts are really going to make that much difference to start with
#9) Getting caught wanking in bed is embarrassing when the other guy only wants to take pictures instead of joining in
#10) Being fooled into showing off your dick with the promise of a towel thrown at your face to "help"
#11) The feeling of sliding right out of your shorts on national television while your cock flops all around for everyone to enjoy
#12) Getting pantsed again by your friends just so they can check out your dick big springing out. You really do need new friends if they aren't getting naked with you