I've actually considered wearing some bizarre costume myself just for the fun of freaking people out. As long as I could get my helmet discreetly under it, of course. After all the heavy slams I've taken, I refuse to ride without my helmet. I do have that large alien mask I could fit in my Heli pack...
Years ago on the first of April I saw a large chunky man snowboarding in nothing but a black speedo, snowboard boots and a black Giro Helmet. I was like
It was funny, I laughed everytime I saw him.
I never had anything crazy happen except when these guys started doing lines of coke off one of their boards in the Keystone Gondola back in the day when the cabins were green. I was like no thanks. Some crazy shit has went down in those old green cabins.