TikTok’s ‘mosquito serial killer’ goes viral for bizarre experiments and notebook of victims
A TikTok creator has been dubbed the internet’s “mosquito serial killer” after documenting bizarre experiments on the insects and preserving their bodies in a notebook.
The creator, who posts under the name Fatsocat, has amassed more than 623,000 followers and 28 million likes through close-up videos exploring the tiny world of insects.
However, it is his ongoing campaign against mosquitoes that has attracted the most attention. Some of the account’s experiments have received as many as 19 million views, with each ending in a familiar and increasingly ominous fashion.
Rather than simply swatting mosquitoes, Fatsocat captures them alive and subjects them to various tests. He has exposed mosquito larvae to rat poison and the liquid inside glow sticks, trapped adults with a mysterious substance and even pitted one against an ant-mimicking spider.
When each experiment is finished, its subject is added to his rapidly growing collection.
Fatsocat’s notebook of mosquitoes sparks ‘Dexter’ comparisons
In one of Fatsocat’s most widely shared videos, he captures a mosquito inside a syringe after allowing it to fill its abdomen with his blood.
He removes most of the air, attaches a needle and uses the syringe to pull in cigarette smoke. When the first attempt produces no reaction, he tries again until the chamber visibly fills.
“The mosquito struggled a little,” the creator narrates. “Feeling dizzy is perfectly normal at this point, and falling asleep is too.”
Once the mosquito stops moving, Fatsocat opens a notebook and tapes it onto a page alongside his previous subjects.
Another video begins with the creator announcing it is “day three of catching mosquitoes” before placing a group inside a container with a burning mosquito coil.
“After inhaling a large amount of it, the mosquitoes completely lost the ability to move,” he calmly explains. “I quietly open my notebook to the very last page.”
He then reveals multiple pages filled with dozens of preserved mosquitoes, each trapped beneath clear tape and accompanied by handwritten dates. Entries visible in the video appear to stretch from May 30 through June 24, suggesting the collection had been growing far longer than three days.
That reveal has helped the videos spread beyond TikTok. A compilation shared to Reddit on July 17 earned more than 31,000 upvotes and 2,600 comments in a day before moderators removed it.
“There were no signs,” joked the post’s most popular comment, while another viewer said the creator was “giving Dexter.”
Others were particularly disturbed by his choice of words. “It was the ‘quietly open my notebook’ part,” one person wrote. “Don’t want to do it too loud lest we wake up the newest entries.”
“Ngl this is legit serial killer behavior,” another said, while one viewer admitted the collection had accomplished the seemingly impossible: “Never thought I would feel bad for mosquitoes but this did it.”
The viral fascination with Fatsocat follows YouTuber Rusty Cage spending weeks experimenting on a Lone Star tick he removed from his body. Cage attempted to kill the resilient parasite by drowning and freezing it, only for it to repeatedly survive his tests.
