So the other night a buddy of mine came across this situation in the parking lot at work. Keep in mind that he is not carrying.
As he approaches his car he notices someone is in it, rifling through stuff. He quickly advances catching the would be thief off guard saying get the "h" out of my car!, what do you think you are doing?, etc. Thief gets out of car and starts talking smack to my friend about his mom and girlfriend. Because my buddy doesn't have a girlfriend, he only begins to smile and keeps approaching quickly closing the distance between him and the thief. The thief who is wielding a motorcycle helmet in one hand and a set of keys in the other like he is going to use them to stab begins to look like he wants to fight. My friend who is good sized just keeps smiling and walking straight at him telling him he is going to kick the "s" out of him. The thief really begins to assess the situation and realizes this smiling guy is really going to wallop on him so he begins to appologize for breaking into the car. My friend trying to decide whether to let him have it or not asks what did you take? Answer - nothing..., so he lets him go. He looks in the car and sees the two DVD's and the stereo looking fine so he believes him and lets him walk away. As it turns out he ended up taking only about $5 worth of change from the ashtray.
How would you have handled the situation had you been carrying?