The marine flatworm Pseudobiceros hancockanus engages in penis fencing [video]. SFW, I guess, unless your boss is a super uptight nudibranch or something.
posted on Aug 15, 2007 - View this thread

Another black eye for ID (youtube link): Zoologist Dan-Eric Nilsson of the University of Lund in Sweden explains how the complex human eye could have evolved gradually from a primitive light-sensitive eye-spot. Via Swift.
posted on May 10, 2006 - View this thread