I'm on my own in the house and I've been singing along to the playlist that I can only play out loud when alone. Only the dog knows the depths of cheese of this playlist (and now potentially millions of MN users, but you're imaginary whereas the dog is real and quite judgemental). 
I guess objectively the most embarrassing is Come on Eileen, but personally I am appalled that I have Nickleback, How You Remind Me, on the list. Nickleback is worse even than Mambo No 5 and Rock Me Amadeus (American version).