The Australian group "5 Seconds of Summer" did something really cool - they dressed up as Target workers recently and attempted to sell copies of their CD to unsuspecting shoppers! Haha.
This reminds me of the time, back in 2005, that I hung out with 50 Cent the day that his CD came out and we called Best Buy locations around town and asked if they had his album in stock yet. When they weren't sure or said no, he went off on them over the phone. Classic stuff.
Check out this article with details of the 5 Seconds of Summer prank!