My DH was "That Guy" once. DH is an average-looking guy; 6' tall, brown hair and eyes, non-descript glasses, etc.- just pretty average. He was wearing a bright blue tee shirt with a white "m" on it as we were attending
MNSSHP and our family costume was that we were a bag of m&ms
so you know the shade of blue that I'm talking about. Anyhow, DH is also pretty laid back, so I wasn't sure what'd happen, but he played it up to the hilt and the audience loved him! They gave him a big sticker that says "I'm THAT GUY" which we put over a button, and he wore it all night. I bet about 10 folks came up to him after to say how much fun he made the show. I was pretty astounded. I wasn't sure what'd happen if he was picked, as DH is not a huge Disney fan
but he's an amazing daddy, terrific uncle, and an incredibly good sport! It was lots of fun!
(PS on the costumes: I bought different colored tee shirts at ACMoore, to match the colors of m&ms. I used sticky-sided white felt to make the correctly-shaped "m" and put one on the front and back of each shirt. I also bought colored craft paint, and painted old pairs of crocs to match each shirt. We all wore khaki-colored shorts and our shirts/crocs. Traveled with my sister and her family, so we were different colored "m&ms"
red, orange, yellow, bright green, bright blue, tan, and brown
just like you'd get in a bag of m&ms. We got lots of positive comments on the costumes, they were easy to make and pack, and we were all appropriately dressed for the warm evening!)