True story.
I'll always remember a post about chef's knives on another forum:
A newbie apprentice bought their first quality/expensive chef's knife and asked, "So, what's the best way to keep it sharp?", and someone replied, "Never let someone else use it"
Back when I was in college, I had various female roommates. One was downright dangerous with just about ANYTHING she got her hands on (eg. waving a loaded CO2 BB gun around and using it to point at people. She'd laugh when they ducked and yelled). She actually cut one of my buddies by tapping him on the shoulder with my kitchen knife while a bunch of us were cooking for a get together

.
His response, "WTF?!!! Don't you know by now that he keeps ALL his knives razor sharp?!!!". When she had me over at her parents, I realized she grew up without a single sharp knife in the house. ALL her mom's kitchen knives were nearly butter knife dull.
I sharpened all her mom's kitchen knives as a courtesy, but in retrospect, based on how often she cut her own fingers using my kitchen knives, I'm wondering if it was a bad idea, and how many times her mom cut herself after I sharpened her knives for her.
A different female roommate was using the same knife to mince garlic. Uses the blade to scoop the garlic off the board, and then walks over to the steel pot on the stove and SMACKS the knife, edge first, onto the steel rim of the pot to knock the garlic off into the pot

"WHAT THE HECK ARE YOU DOING?!!!" SEE THE BIG DING YOU JUST PUT IN THE EDGE?!!!". "Huh? Oh... how else am I supposed to get the garlic in the pot?"
Cue Charlie Brown "Oh, good grief..."