Many of the people are returning their iPad2 which they bought from Apple due to some reason. The reason might be the light Glitch which was occurring due to not properly dried the glue in iPad2.
Recently an iPad2 came to Apple with a note:
[Apple's] focus this week has been to troubleshoot all the iPad 2s that customers are returning to the stores. One iPad came back with a post it note on it that said “Wife said no.” It was escalated as something funny, and two of the VPs got wind of it. They sent the guy an iPad 2 with a note on it that said “Apple said yes.”