What major injustice are you still salty about years later?

In a fifth grade science test, the question was, are there any stars in the solar system?

I answered, yes. The teacher marked it wrong. I went up afterwards and said,

What about the sun? He said he meant all the other stars aren't in our solar system and he kept

it marked wrong. Although I'm harboring this for 50 years now, he was all around one of the best

teachers I've ever had and just passed away a week or so ago. But damn, that should have been

marked right. When I was in high school, someone tagged up the school. They announced there'd be a reward for anyone who rats anyone else out.

I got called in the office and found out I was suspended for vandalization.

I didn't do it and I had no idea who.

Four days later, I'm allowed to come back to school because they found out who actually

did it.

I just got an apology.

Me and some others in primary school were saying

the biggest numbers we knew of. Everyone was saying like 100,000 and a million, and then I'm like

a trillion, and they refused to believe it was a real number. On a fourth grade math test,

we had to make a shape that had only four sides, one set of parallel

lines, and only one right angle. They were probably more requirements, but I can't remember.

I remember almost crying at my desk and spending 20 minutes on that one question,

while constantly telling my teacher that it wasn't possible, but according to her it was.

And the next day, we went over the answer key and the answer had

two right angles. When I was in high school, I was occasionally allowed to drive my family's third car.

It had a slow leak in one of the tyres, so we were all supposed to check the pressure and put air

...