What Happened to Matthew Perry?

Seasons three through six of Friends had some of Chandler Bing’s funniest and most character- defining moments. There he is handcuffed, without pants, to a filing cabinet; remaining in “time out” in a box for nearly a full episode; hooking up with–and later marrying–Monica...We all remember them fondly. The one who doesn’t? Matthew Perry, who says these seasons were a blur due to his problems with substance abuse as we discover in WTF Happened to...MATTHEW PERRY?