USA Today:
Recently, George Clooney expressed some concern about entering the third dimension in Gravity, his sci-fi adventure due next fall. Although he had a cameo in Spy Kids 3-D, he told USA TODAY, " It's the first time I've been in 3-D and, hopefully, the last time."

Perhaps his co-star Sandra Bullock, whose medical engineer ends up being stranded in space with Clooney's seasoned astronaut, can elaborate on why he had such a bad reaction to the process. (Cinema, George Clooney, Gravity, Sandra Bullock)