I was in the local 'accelerated program' in elementary school. In fifth grade, this kid we'll call Tyler got transferred into our class (we had basically the same classmates from 2nd-5th grade, and transfers in were not something that happened often). He was a scrawny, pale kid with bleach blond hair, who always wore a red puffy jacket- it didn't matter if it was 95 degrees out or -15 degrees out. Anyways, Tyler took a liking to me because we rode on the same bus route, and I was nice to pretty much everybody in elementary school, even though he was really weird. Every morning on the bus, he would sit in his own seat in his red puffy jacket, and make crazy eyes at the seat in front of him, while singing various 90s metal tunes. Sometimes, he'd do that 'I'm watching you' move, with your two fingers towards your eyes, then to your target, but it was to the bus seat. He also occasionally would bring a fried egg sandwich on the bus to eat for breakfast.
On Valentine's Day, he brought me a carnation and gave it to me while I was playing kickball. When it was my turn to kick, I handed it to a friend to hold, because I wasn't about to play kickball holding a flower. Tyler saw and immediately became livid. He walked into our game, grabbed the kickball, and announced that he wasn't going to breathe until I took the flower back. He sat down on the pitcher's mark and held his breath until his face matched his little red puffy jacket, and my friend ran over to me and shoved the flower back at me so he'd go away.
He did a lot of other weird shit, but the ones that come to mind first were the time he gave everybody in the class alternative names and lives for a week and asked everybody about their other lives incessantly. None of us had any idea what he was talking about or why he was calling us other names until he told us afterwards it was 'all part of the plan.' Another time, kids in the class who scored above a certain average on all of our spelling tests for the quarter were rewarded with an ice cream social. Tyler didn't qualify. He proceeded to make a hit list (this was back in 2000, so Columbine was still pretty fresh) of everybody who got ice cream, and the only reason anybody knew was because he told me he was sorry, because he loved me, but he was going to have to shoot me too because I got ice cream and he didn't. I told the teacher because I was like WTF MAN, the police got involved, and he got expelled. IIRC his dad was in jail for some sort of gun-related charge and he totally had access to weapons. He was weird. I hope he got help.