I was in the auto spares shop, and there was a locked cabinet with knives in it (Off road camping type knives. Vicious, capable, business looking knives. When-you’ve-run-over-a-cow-and-you-need-to-cut-it-up-so-you-don’t-waste-the-meat type knives). “So,” I says to the guy behind the counter, “my sixteen y/o son couldn’t buy one of those?”.
“Certainly not.” he replies.
“Could he buy a Stanley knife to cut out fabric to make a new door card for his restoration project?”
“Probably not”.
“What about a paint scraper, that uses Stanley knife blades for scraping?”
“Ooooh yes” says he, cottoning on. “It’s not a knife, is it?”
“Set of screwdrivers?”
“What, nice new sharp ones that haven’t yet been used as chisels, levers, scrapers? No problem.”
“Chisels?”
“Not really in the spirit of things. Bit of a grey area. Sort of designed for stabbing, aren’t they?”
“Set of screwdrivers and a whetstone?”
“Sure! No problem.”