What was your "we have to leave now" moment?

A favorite on /r/askreddit, or at least it seems that way to me.

I only have one, and it's not very entertaining.

I was on a bus going to work. A few stops before mine the bus gets cut off by another bus. The driver started yelling at the other driver then pulled over and got out of the bus to, I assume, escalate the conflict. We were near my stop anyway, so I got off before things could get hairy.