My kids were given a really cool remote-control robot by MIL yesterday. They played with it all last night and they asked for it first thing this morning. (yes, my kids are awake already!) They are usually very good at sharing too, but they seem to be taking much longer turns with the robot. I know eventually the batteries will die and they will move on, but I'm curious what toys your kids have obsessed over? Was it when they were asking for a certain toy or when playing with it? How long did the obsession last?