(costumes, buying weird stuff, whatever...)
I'll get the ball rolling- I wasn't in costume (unless you consider a tux a costume) but two years ago when I got married the groom's side of the wedding party walked in to the theme music from the original 'Battlestar Galactica'. When the ceremony was complete, I kissed my bride and we walked out to the 'Raiders of the Lost Ark' theme! And the funny thing only a few people really picked up on it.
