I have never experienced serotonin like this from a stuffed animal, but I will say that he does make a harrowing addition to the house. He scares my roommate when I set him in chairs, and he spooks my partner when I lay him on our bed and tuck him in, but he's literally perfect, the softest stuffed animal that I've ever owned, and I have zero regrets about the stupid amount of money I spent purchasing this.