Here is a fabulous article on the role of testosterone in comedy. The piece itself is both thought provoking and entertaining, as well as being a complete pile of rubbish. However, putting all that aside, this must be the quote of the day;
He suggested men might respond aggressively because they see the other unicycling man as a threat, attracting female attention away from themselves.
I know that when I am on my unicycle I frequently think that the other unicycling man is a threat, but the feeling passes when I get off the wheel.