Well, I didn't actually do it, but I thought about it.
There I was, minding my business in my usual seat on the Metro, when this guy sits down next to me and starts talking loudly: "I would like for you to check one more place, in the downstairs bathroom." Oh, okay, he's on his cellphone and calling home. Clearly he's misplaced something. So he hangs up and swears aloud. And then swears aloud again. Tries to dial his cellphone, gets nowhere, swears about *that*. Complains that his phone is getting no signal in the tunnel. Complains about the delay when the train doesn't start moving as quickly as he'd like -- "Come ON!" And so on.
It wasn't a constant tirade, but jeez. I nearly leaned over to him and said, "You're right, the Universe *is* picking on you today," but I figured it was more likely that I'd get a snarl than a laugh.
Anyway, I was glad when we finally got to my stop. Predicably, he was one of those folks who didn't get up to let me out -- instead he swung his knees sideways to make room. (I always sit near the door, where the seat "in front" of me makes an L shape, so it's possible to get past a knee-slider -- but I always give extra points and a nice "thank you" to folks who stand up.

) Anyhow, it was good to get off the train. Commuting's miserable enough without broadcasting your angst to your fellow passengers...