I had one just a few weeks ago. AA PHX-DTW. Super 80.

The first plane went mechanical, the second was about 1/4 of the way down the runway when the reverse thrusters come on. Pretty exciting. I think one of the fire suppression lights came off. After sitting on a vacant piece of tarmac for an hour, they switched to the secondary, and away we went.

I flew 3 AA segments, and 3 mechanicals. Oh, joy!