Got one better for you. RJ guy on a mainline JS watches one of the last 737-200s taxi by before they were all gone. Actually utters the phrase, "There goes my captain's seat." It was a very quiet flight. Afterwards, the boss turns to me and says, "Did he really say what I thought he said?" Turns out the captain hadn't really heard him and said he would have returned to the gate and kicked him off if he had.

Now, I've also heard from friends still at regionals who have told me of mainline guys opening their mouths and inserting foot, so it's not limited to any one group. There are fools everywhere who don't think before engaging lips. You just gotta take 'em with a grain of salt.