Sebastian finds evidence that he's a gun nut... in the laundry room, of all places.
For me, the most damning evidence of gun nuttery was when I discovered a cartridge in my purse. Not just any cartridge, either. This was a big-bore rimfire cartridge that had to be a hundred years old, its copper alloy case green with verdigris, and I had no idea what caliber it was, when I had received it, or who gave it to me and where. It was just rolling around in the bottom of my purse... No doubt someone had known of my fondness for 19th Century firearms and handed it to me during a conversation and I had filed it away in my purse without filing it away in my memory.