I love gibbons

http://www.mercurynews.com/breakingnews/ci_9590634

"Gibbons raised by humans, with little or no contact with other gibbons, are likely to be afraid of their own kind, Mootnick said. Gibbons are prone to "moon" an onlooker if the stares, from other gibbons or humans, make them uncomfortable. If they're very upset, they'll sometimes break wind in the direction of the presumed antagonist."