Butsukari otoko
Butsukari otoko (ぶつかり男, 'Bumping man') is a Japanese term that refers to a person who deliberately collides with passersby in crowded public places, such as train stations. Perpetrators described as butsukari otoko are often men in their forties or older, and it has been reported that while targets may include men, smaller women are more frequently targeted.