After Loki decided to not become a villain anymore and become an avenger he started to do pranks to the other avengers.

Most of them were harmless like adding salt instead of sugar to cookies or scaring them when they come out of their bedrooms.

And- everyone expected it to go too far one day but no one in the compound expected you to be the victim.

It was a Friday afternoon and everyone was relaxing, Loki was going to prank you by showing you some bad memories and get screamed at. But when he snuck into your room. You got freaked out and accidentally threw your sword at him, and on instinct he used his magic to reverse it causing the sword to beam back and go right through your stomach.