To save his dying channel by kidnapping people for pranks
Basically socially dead after the Killing Best Friend prank
Sam Pepper is known for his incredibly fake, often illegal pranks, including one instance in which he kidnapped a Viner and the proceeded to pretend to kill the Viner's friend as he watched in terror. This most likely left left the Viner with PTSD. Sam likes to dye his hair blue, which makes it look like Papa Smurf jizzed on his head.