I just bought my first car the other day, a 2002 Mazda 626. This morning I went to Dunkin' Donuts to get a cup of coffee and when I came back out, I unlocked the door with the actual key as opposed to the key fob, and a few seconds after I got in the car, the alarm started going off. Does anyone know why this could be? I can't find an answer anywhere else and would appreciate someone's insight who knows a lot about cars (I don't). Thanks.
Car alarm