Dowsing someone in cologne or other flammable household liquid (not gas, or lighter fluid, etc.), and wetting them on fire. Generally accepted as illegal, as it usually results in pretty severe burns.
Named after the city where the prank recently occurred, as documented in the following news story: http://ap.google.com/article/aleqm5ii7aelivdnmuasbptg0wbhnvppgad922im180