Hmmm... guys, the fellow being pranked is a professional manzai comedian. Knowing Japanese comedy shows - like this one - he is already scarred. In fact, this one is famous for making an incredibly weird grimace while crying out "Kuyashii desu!", i.e. "I'm vexed!". Example. Also, knowing the Japanese comedy world, while they are not lawsuit happy at all (like the rest of Japanese society) they do get the consent of the comedians' managers before pulling any kind of prank, since the talent agencies that represent the comedians do care about their image. Other pranks include diving in near-boiling water, getting your apartment ransacked on live TV while you're on the other side of Japan, etc.
Japanese Sniper Prank