I love Lego! I stopped collecting around the time the Harry Potter and the Chamber of Secrets sets were coming out. I think my last ever set was Hagrid's hut or whatever. I was kind of OCD about my toys as a kid, and I still have all the proper pieces for each Lego set in separate shoeboxes, each one marked appropriately. That's not to say I didn't mix and match, though. I did, all the time, but I always made a checklist of what went where, and I always put things back where they belong. Unfortunately, this trait hasn't followed me to almost-adulthood.