It sounds like you're referring to the viral "Two Kids, One Sandbox" video — though I should note that title is often confused with or parodies a much more infamous internet video from years ago.
Deceptive Titling: The title sounded like a home movie or a cute YouTube clip. This "bait-and-switch" tactic led thousands of people to click on it, only to be met with graphic imagery.
The video didn’t go viral because people enjoyed it; it went viral because of "Shock Baiting." two kids one sandbox original video
The video typically features two individuals engaging in explicit, fetishistic, and unsanitary acts involving a sandbox [3, 5]. It quickly became a staple of "reaction" culture, where users would trick friends into watching it to record their horrified responses [4]. Why It Went Viral
Notes for proctors
The Magic of Creativity and Imagination
LEO: No, I’m making a volcano.
The Legacy of the "Two Kids, One Sandbox" Video