FFS, it's one pencil. They can borrow one. Or you can keep a couple of spares in the classroom and insist they are given back. If a student breaks, throws or refuses to return your pencil, then that is deliberate bad behaviour and should be dealt with.
There was a teacher at my school who actively hated me. That's not paranoia - I bumped into another teacher who worked in the same department last week and he admitted to me that he'd regularly had to go to bat for me with SLT because she was trying to sabotage me, things like saying I'd cheated on my coursework when he could prove I hadn't.
Anyway, I forgot my lab coat one day. We were doing a practical exercise which counted towards my AS grade. There were multiple lab coats on the pegs in the lab. She said I wasn't allowed to use a spare labcoat. I had to sit out of the lesson and got a zero for that practical.
Another time, we'd done clean up and I accidentally left a test tube out. She docked 50% of my marks for it.
These two combined incidents brought my grade down from a B to a C.
I'm sure there'll be plenty of posters along to tell me that someone who forgets to bring a lab coat to school one day or leaves a test tube out doesn't deserve a B in AS Biology and how earth shattering the consequences would be if a Biologist forgot to put away a test tube in the real world, but neither of these things were done to teach me accountability. She wanted me to fail. She even told my mum as much at parents evening.