How about the pax who is telling his buddy "how airplanes work". While boarding a 757, I overheard him say that you wouldn't want to lose both engines because "these things will fall out of the sky".

Or: while boarding my four-hour commute flight to go home, a lady is talking about how much she travels. Turns to me and says, "I probably do this more than you." Me, "Uhhh, no you don't"

Or: the tool captain "yeah, I'm easy going....just a couple of things". Followed by a list of hoops you have to jump through so his brain won't explode if you do it wrong.

And: I knew a flight instructor with the license plate "PILOT". He once walked into the instuctor's lounge where we were all chatting and said, "Ask me something I don't know". True story.

Also: the tool that poses an interesting question while at cruise. You take the bait. Then spends the rest of the trip trying to sell you on his pyramid scheme.

Man, I could go on and on. Love this thread