So I went to the comic store to pick up Ultimate X-Men #63. I grabbed the copy off the rack and noticed that it felt a little thick. I took a quick look to make sure it wasn't two copies, one inside the other. It was only one, so I shrugged and bought it. I get back to my dorm to thumb through it before I go to class. That's when I noticed why it felt thicker than a normal issue. It has two covers. Two of #63's cover must have gotten stuck together on the assembly line and stapled onto the comic. It's pretty cool, though. It's unique in my collection because I've never seen this before. I've bought comics with coloring/inking errors, dialogue mishaps, and one with mixed up pages (which was widespread), but not one with double covers.