I admit, the idea and the act, is NOT FUNNY. I initially thought that it was simply not well thought out by this individual and his unexplainable reasoning was the funny part, in that it was mindless. Also, to be specific, the context of him telling his family goodbye and going into the bathroom in a full suit, to commit suicide while his family simply stood by, was something out of a Family Guy episode, therefore seeming humorous to me.
Obviously, suicide is tragic and devastating.