What began as a small stunt by seven New York subway riders in 2002 has turned into a global event. The original pranksters, who formed the group Improv Everywhere, said pants were dropped and legs bared in 60 cities, including London, Hong Kong and Johannesburg.

The annual event has become a global celebration of bare thighs. The 'celebration of silliness' is designed to make other subway riders smile.

The event has drawn some criticism from public officials in recent years. In Romania, subway officials said Friday those "who disturb public order or are indecent will be fined" and reported to the police, the Associated Press reported.