What is your 'Whew, that was close' moment?

Back in college, I had a car that I loved, but it was an old piece of crap. Driving between my parent's house and home, a car did something stupid in front of me and I had to stand on the brakes to avoid an accident.

Nothing too unusual about that. However, when I got back to town, I was coming along to a stop light, which was red. I stepped on the brake pedal and felt a pop like standing on a water balloon — and I wasn't slowing down. I had about a second before I was about to plow into the tail end of a car at the stop light. Fortunately, the right-turn lane was clear, and it went into a road that went slightly uphill. I hit the turn lane, headed up the uphill street, turned into a parking lot and coasted until the car came to a stop.