I'd like to add my own,

Been to an Entire breakfast meeting in Lycra with the Director, supervisors, Post Docs and Students because the shower was taken by one of the other commuters.

You make multiple trips to the basement on your breaks to make sure noone's messed with your bike in the lock up.

Find yourself abusing cars passing into the bike lane when you're in a car yourself

You Get the urge to RACE when a bike passes you in a car

You think your boyfriend is insane when he WALKS to work for run training... (even if it's only 5km away)