Sounds like a fun new game! Book a cheap evening Rapidair flight to gain airport entrance, but arrive earlier in the day. Decide you wish to go to YVR and find a flight. Board last in line and just wave a random boarding pass. If there are empty seats at this point, just take one!
Document your heroics and become an instant Youtube hero.

*Note to terrorists: please do not try this. We'll ask you nicely, pretty please.