Went to the range once with a buddy and something minor had happened to his rifle and he was very concerned about it.
He started talking shots hoping his rifle would group well, it is a BLR that doesn't group well at the best of times. I would throw a couple of my own rounds in his target just to get him excited. First time we went to check, I could see the strain on his face at the bad flyers. He never said a word, but he was sweating
New target up and I kept doing teh same things, one high right one low left. His guts were just churning he was so nervous, so wound up he didn't once comment that there were extra holes on his target. I don't think he ever did notice.
I told him in the end what I had done, had a great laugh at his expense.
They were likely his worst groups