Many years ago, I had a Triumph GT6 Mk2 with a tuned 2.5l in it. Had recently rebuilt the rear halfshafts and uprights with all new bits. Driveshaft had a genuine GKN UJ fitted
Few weeks later, during some very spirited driving the UJ sheared while giving it the beans out of a corner
I sheared a UJ on the intermediate prop on my 4x4 dodge wrecker on the way to a job . Luckily it was the short yoke, so I took the front prop off, used the short yoke from that on to the intermediate shaft, and carried on out and did the job.
A lucky escape.