I have had a few awkard silences and a few other customers behind me giggling at what I'm buying.
But there was one time when I went to walmart to get Femme Fatale, it was the week after the original release (Walmart is a half hour away from my house so I wanted to MAKE SURE they'd have it). So I get to the store and I wanted to buy the deluxe but they only had the standard so I bought it, I went with my friend and he was still looking around so I just scoped out the rest of the CDs and ended up finding a copy behind another CD. So I went to exchange it and the girl gave me this weird look and she said if there was anything wrong with the CD and I said no, I just bought this a second ago and I'd like to exchange it for this one, she looked so ffing confused and she probably thought I was insane and she literally stared at them for like 2 minutes and I finally said "is there a problem?" and she said, "well if you want to exchange a cd with the same cd, there has to be a problem with it", and I go "ummmm... it's kind of not the same cd, it's the deluxe edition" and then she goes, "does that make a difference?"
And then she said "OH WAIT A MINUTE, this cd has a different color to the cover....so you just want this cd with a different colored cover on it?" There was like 5 people in line just staring at me, very awkwardly. I just ended up saying "YES, I want the different colored one... and I just about grabbed my friend and ran out the store embarrassed LOL"