first come, first serve

So I'm at my local U-Haul getting ready to pick up a truck I had reserved for my move. This place starts their Saturday hour of business at 7am. I get there at 6:45am as I am very eager to start my move. I end up being the first one there and about 10 minutes later some other guy shows up. Once the clock strikes 7am, the other dude rushes for the door once the clerk unlocks it.. WTF! This guy clearly sees me when he gets there AFTER me and totally disregards that fact. I guess this guy has never heard of the term "first come, first server". Or maybe he has and he is just a plain old douche-bag. Man, some people..