Is it normal to prank someone into eating your dandruff?

When I was in college, there was a big fat kid whom I would see periodically in the dorm cafeteria. I don’t think he bathed regularly because I heard that he had b.o. This kid also had a serious dandruff problem- one day he was wearing a black shirt and I noticed a bunch of white specks on the back of it. My buddy went up to the salad bar and walked behind the fat kid and told me that the white specks were dandruff! Anyhow, later in the semester I saw that guy sitting down at a table with some skinny kid and at one point, the other kid got up to get a refill of soda. There were a few people line at the soda machine, so it took him a couple minutes. I saw the fat kid grab the skinny kid’s salad plate and he started rubbing his fingers through his hair while shaking dandruff from his head onto the skinny kid’s salad plate! After about 20 seconds of this, he put the salad plate back where it was. When the skinny kid sat back down, he started eating from the salad plate, not realizing that there was dandruff in his salad!

Is it normal to prank someone into eating your dandruff?