Parking stall
When you enter the parking lot at work, see a co-worker who you don't want to talk to, and after parking you stall by pretending to have to do some fictitious task in your car just to avoid talking to the person.
(Pulling into the parking space) "Oh great, there's Ned the Nerd, whose going to bend my ear again regarding the latest Star Trek convention. I think I'll parking stall by waiting in my car and do a bit of "organizing" and "looking for misplaced items" until Ned gets half-way to the building."