I've always been surprised at the liberties strangers take to tell another adult their opinions, or much less to reprimand another.

Today, I pull into a gas station and all pumps are full.  As I'm pulling in, a car, coming the opposite direction stops.  As I wait to see what he's going to do, I decide, I have no time to wait.  So I simply zip a left in front of him and U turned to the pump I wanted.  Guy was just leaving so I pulled up to the pump.  As I'm getting out, there's older guy on the other side of the pump and I did my normal "hi stranger" smile and proceed to commence pumping. Then I hear:

Older Man at Pump:  That sure was a zippy little move you pulled.  Dangerous.  Very dangerous.
Irritated Me:  Uh huh.  Thanks for your concern, but I'll live.
Fat Bastard:  Well, I hope someone else does.  *calls me something under his breathe* 
Pissed off Me:  Well, aren't you happy it wasn't your fat ass in my way?
Fat Bastard:  It could have been my fucking kid, you bitch.
Pissed off Me:  (thinking - NOW I'll be a fucking bitch)  I can tell you really care about your kid by the way you call him your 'fucking kid". And then he must be fucking retarded if he can't watch traffic. Mofoka must be what - 40?
Fat Bastard: (studders something)
Laughing Me:  Wait.  (pulling out my wallet - looking at my ID).  Yup.  I am still an adult - so why don't you just shut the fuck up and and pump your gas, you meddling fat bastard.
Fat Bastard:  *speechless*

Yes, I curse at strangers...so?

For some reason, I felt so much better after that exchange...and I actually left the gas station smiling.