Last year someone was sending one of those around at my work…I didn’t know it, until the poor girl in the cube next to me suddenly screamed at the top of her lungs and I ran over to see what was wrong with her.
The rest of the day you’d be sitting there working quietly and suddenly some guy would shriek like a little girl across the room. Delightfully evil.
(however, I think it’s just mean to send them to people who are notoriously easily scared, and unforgiveable to show it to little kids)