Just to keep the list short, I'll mention two.
First, back when I worked for a living, I had occasion to buy an AMT Hardballer Govt. Model 1911. Wanted a Colt, but being newly married and just a couple years OTJ, there wasn't money for it. The Hardballer fell within the budget guidelines, and I didn't know enough about .45's at the time to know that they were junk, unreliable, didn't shoot straight, and couldn't be forced to function right. So, off to the pond dam I go, with an assortment of hardball and a couple different hollow point loads.
All the target ammo flowed through the gun like slippery snot, almost always hitting where I pointed it. Then to the hollow points. One of the boxes of HP was the old Flying Trashcan, which of course could never be made to work in the junk AMT. Except---almost the whole box went into the chamber just fine, and (gasp) kept hitting the target! So, I kept two magazines worth, to carry for work, went to the next qualification with the worthless, piece-of-junk gun, and proceeded to ace (no pun intended) the course, and promptly began carrying it as a BUG and off-duty piece.
Later, for some stupid reason I don't remember now, I traded it off. Stupid stupid stupid.....
Second, I had a Concealed Carry student qualify with a Taurus 9mm Slim. I was looking the gun over, and he asked if I wanted to try it. I'm not a fan of baby 9's, but any time I can try a new (to me) model, I will; and, I didn't want to hurt his feelings. He put five rounds in a mag, and from about 10-12 yards, I proceeded to put all five of them in a hole I could cover with the pad of my thumb. Still not a fan of tiny 9's, but if ever I'm in the market for a watch-pocket gun, this one will be high on the list to think about.
Sorry for the long post. Acebow