To have one's chin rest on top of anothers index and middle finger only. The percher must perch the perchee by surprise. Most people are unperchable because they do not like to be touched near the neck and it is quite impressive if someone is perchable. It is against the rules of perching to perch yourself.
TO GIVE A STRANGER THE PERCH CAN LEAD TO SEVERE PHYSICAL DANGER TO THE PERCHER.
Bar incident: Billy bumps into Johnny accidentally. Johnny, very mad, turns around and gives Billy The Perch. Billy knocks Johnny out. The end.
Lunchroom incident: Sally and Bobby are eager to take their midday lunch break. They sit at their lunch table to enjoy a little sushi. Sally, thinking it woPeruld be funny, gave Bobby The Perch. Bobby immidiately began choking on his california roll. R.I.P Bobby.