Never in what could be called an accident but a few scary experiences.
An aborted takeoff on a snowy day at BUF on a (then) USAir DC9. Not good at all. We basically skidded to a stop, but at least we stopped or else we would have come to rest on the New York State Thruway.
A scary go around in an American 767 landing at JFK was another one. We were over the runway, about to touch down, and all of a sudden, up we went into a hard (and I mean hard) left turn. Looking out the window on the left side of the plane it seemed as if I was looking straight down at the ground. The pilot told us, once safely on the ground, that a plane had wandered onto our runway.
Happy New Year to all airliner.net denizens!