Often times I find myself buying at least two of something I like, when all I really needed was one. I don't go crazy when it comes to having redundant objects, but I at least prefer to have a spare on hand. I think this stems from numerous Murphy's law incidents. Where, when something breaks or goes missing, it tends to be at the worst possible time. I figure if I don't have at least one spare, I'm not going to have any when I need it.