You don’t need drugs to be certifiable
Any technical job that involves helping masses of uncensored human beings understand technology will eventually wear the average man down, causing him to go bat-shit crazy and scream at the top of his lungs
Adam Knight, of After Apple fame, has written an excellent article about his thoughts on life as a phone monkey for Apple Technical Support (a.k.a. AppleCare). It’s pretty long, but a must read for anyone who has suffered the daily routine of life in a call center.