What was I thinking?

I ran into an old work colleague, which got me hunting around for a photo from a Christmas do - probably somewhere around 2001.

What was I thinking, with blonde hair, trousers that are far too tight (and showing my navel) and all that shoulder on display? To say nothing of the stupid grin. I think I liked the photo at the time as well. Shudder. The flash is on the original photo, looks like something from the 70s. 

Dare you post your "what was I thinking?" photo?