Can I get off now?

I don't know about you, but if this train pulled up at my stop, I'd think twice about getting on.

I think you have to ask yourself, "Do I really want to go there?"

Must be difficult on uninitiated visitors:

"So, where you headed?"

"Angered."

"Whoa! Slow down there! I'm just tryin' to help!"

Also, it's probably a moot question, since the train has already stopped at Irked and Upset, but I'd still like to know where this line originates. Irritable? Dyspeptic?