That's how I did mine many years ago - drunk as a skunk, pulled away from lights (fortunately no traffic around), trying to clip in, looked down to see what was happening ...oooof ! I thought I'd just smacked it badly until a few days a later a rugby player I knew put me straight !
I think I cycled mostly one handed - probably drunk enough not to feel it

Luckily it was pretty much healed in 2-3 weeks - I know a few people that had to have theirs pinned after several months.
GWS !