Being a police officer (retired) we hung out in gun shops a lot.
I wasn't there when this happened but:
Fellow came in and wanted to buy a handgun and TWO bullets.
The shop owner sent him on his way.
Pronto.
A fellow, some years later came into the same shop and asks for a s.g & FIVE rounds.
The shop keep sent him on his way. The guy smelled of booze.
An hour later the guy goes into a local Sears, buys a single shot 12 bore but the clerk won't sell him the ammo as he'd been drinking.
(but she sold the gun????)
The guy goes to a buddy & bumbs five rounds so the buddy GIVES him 5 slugs.
The guy shoots his estranged in the chest ( I watched that happen
-long story)
The gun won't break open saving her 3 girls. We force our way inside and physically take him down before he can do more damage.
The gun, a Brizilian import, sprung & wouldn't open.
Ya just never, never, know.
I have several sickening stories similar.