I have never had one. I’ve had a couple of chances but I refuse to throw off on a shot just to get one.
We had a bowler once that had a chance at a triplicate score, 215 I believe.
They left a 7 – 10 on their second shot in the tenth and needed one pin to get the triplicate. They threw at the 10 pin and knew they had nailed the pin, turned around, threw their arms up in victory for the triplicate, and then the 10 pin bounced out of the pit and took out the 7.
I would rather have the 7 – 10 patch myself and once the shock wore off they did too.