Technically this could fit in the anime/manga thread, but I decided to put it here since it was a video. I went to this convention back in May, but I realized I never posted a video recap. Lots of epic costumes in this vid, skip to 2:15 for the montage to start. A lot of the costumes I saw weren't just anime, you see the first one right off the bat was TF2. I didn't make this montage, but I met the guy at the convention who did.
Anime North 2011