There are plenty of Memorial Day marathons scattered over the TV landscapes, but you’d be hard-pressed to find one with more laughs per hour than this one. Beginning at 9 a.m. ET, and running until almost 5 a.m. Tuesday, Comedy Central is showing a marathon of the 2001-2010 medical sitcom Scrubs, starring Zach Braff. It begins with the very first episode, and continues by showing dozens of what the network feels are its best episodes ever. So my Memorial Day prescription for good humor is: take one episode of Scrubs every 30 minutes as needed.