Kanchō
Kanchō (カンチョー; pronounced [kaɲtɕoː]) is a prank performed by clasping the hands together in the shape of a finger gun and poking the anus of an unsuspecting person, often while exclaiming "Kan-cho! " It is a common prank in East Asian countries such as Japan. In Korea, it is called ttongchim (똥침; 똥針, pronounced [t͈oŋ.tɕʰim]), and in China, qiānnián shā (千年殺, "thousand-year" or "immortal kill").