I was thinking of this fella and his obnoxious behaviour on daily basis. I have called him Screamer. He is a repulsive turd, I would like to call him that as well! He erupts at least a few times a day. You're sitting and everywhere is quiet. everybody is busy with what he or she is doing and all of a sudden you here someone scream! It probably reminds you of that commercial for Alien where it goes: In space no one hears you scream!
Anyways my suggestion is to slip him a mickey early in the morning right after he arrives at the office! If the proper dose is used, it should keep him calm all day long, possibly to the afternoon. Now the question is should it be done with his consent or without because I know people who actually take downers to be able to work. Some people drink alcohol just to make it easy on them. The later would consider illegal but how about the first? If it is supervised and a medical professional confirms that, the guy does not even have to know it. It could be only said to the H. R. people. After all this is for the benefit of the company and its employees so there should not be a problem!