...When you're 'Total time logged in' goes from 5 hours and 3 minutes to 7 hours and 26 minutes while reading 35 pages in a single thread
...when you hate carrying anything. at any time. anywhere.
...when jeans just aren't worth it anymore.
...when you get stopped by a train and wonder exactly how fast it's going.

...when you offer complete strangers to crash at your place for a national jam.
...when you change every 'Chuck Norris' joke you know to a 'David Belle' joke.
...when you watch Ong-Bak: Thai Warrior and Tony Jaa becomes your new hero.
(I saw this movie before I knew what parkour was, and I couldn't shut up about it for weeks. "Dude, I'm telling you! This guy actually ran on people's shoulders!)
...when running on people's shoulders doesn't look that hard anymore.

...when you wish that you knew anyone who was even remotely interested in physical activity that lives nearby, just so you could jam at whim.
...when it's your birthday, and the ONLY thing you do is look for spots to hit (happened last Sunday to me! lol I'm 20 now..)