From Alexander Zaitchik's three part (1, 2, and 3) mini-biography of Glenn Beck on Salon.com comes this nugget:

Beck was known at B104 as a pro's pro in the studio but was becoming increasingly unraveled when not working. "Beck used to get hammered after every show at this little bar-café down the street," remembers a music programmer who worked with Beck. "At first we thought he was going to get lunch." The extent to which Beck was struggling to keep it together is highlighted by Beck's arrest one afternoon just outside Baltimore. He was speeding in his DeLorean with one of the car's gull-wing doors wide open when the cops pulled him over. According to a former colleague, Beck was "completely out of it" when a B104 manager went down to the station to bail him out. In his 2003 book, "Real America," Beck refers to himself as a borderline schizophrenic. Whether that statement is matter-of-fact or intended for effect, he has spoken more than once about taking drugs for ADHD, and when he was at B104, Beck's coworkers believed him to be taking prescription medication for some kind of mental or psychological ills. "He used to complain that his medication made him feel like he was 'under wet blankets,'" remembers the former music programmer.

Today, when Beck wants to illustrate the jerk he used to be, he tells the story of the time he fired an employee for bringing him the wrong pen during a promotional event. According to former colleagues in Baltimore, Beck didn't just fire people in fits of rage -- he fired them slowly and publicly. "He used to take people to a bar and sit them down and just humiliate them in public. He was a sadist, the kind of guy who rips wings off of flies," remembers a colleague.