prankless harm

A type of prank that usually causes either physical injury, psychological harm, or both. A prankless harm can be done intentionally, but it is also possible for it to be done unintentionally.

Person 1: Yoo, I pranked Jeremy so good yesterday! I told him that I put goat sperm instead of half & half in his coffee and he totally bought it!
Person 2: Dude, that's fucked up, you probably made him paranoid for life. Talk about a prankless harm there.