Thought of another one...

Flying to EWR one day in the winter and they are getting hit hard with lots of snow and wind. Of course our flight is delayed for hours and I roll up into the terminal to get a cup of coffee and mingle with the agents. When I reach the top of the jetway, a male passenger is at the podium berating these two female agents. He then turns his attention to me and starts yelling louder:
Pax: And you! You're just too scared to fly in the snow! Why won't you just admit that to us instead of blaming it on the weather or ATC!
I start laughing but do my best to stifle it, trying to remain professional.
Me: Sir, I'm curious, what do you do for a living?
Pax: I'm an insurance broker, what's that got to do with anything?!
Me: Oh perfect! So you must have some idea how stupid it would be for someone to get into a semi-truck and go hurtling down the interstate at 140mph in heavy snow and strong crosswinds, right?
Pax: Uhhh...
Me: Because that is exactly what you are proposing we do here with you and your 49 comrades here along for the ride.
Pax: Uhhh...
Me: Unless you have any other questions, I'm going to get a coffee *turning to the agents* Can I get you ladies anything?

The agents loved it. When I got back the guy was sitting back in a corner, fuming into his Blackberry about "the rude staff at this mickey mouse airline".