For my high school graduation, students walk onto the stage in pairs, and are expected to do something interesting (most do some variation of a dance move or handshake) when they meet in the middle, before going to their seats. Having been to my sister's graduation last year, I knew ahead of time that I wanted to make my entrance more interesting and less awkward than the ones I had seen.
I built two pairs of glasses - one for me, one for my walk in partner - that, when turned on, display "2012" across the two pairs.