"Only child of a single parent here. We moved a lot. Went to grammar school for a year with a kid who made my life miserable. We moved away. Eventually moved back to the area for 8th grade. My math teacher paired me with a kid who wasn’t doing well.
It was my former nemesis. He didn’t remember me. I intentionally taught him incorrectly. He ended up failing 8th-grade math and didn’t advance to high school with everyone else."