It's pretty obvious people love to laugh given the prevalence of comedians, jokers and humor throughout all human cultures. My question is how and why did this trait evolve? No animal I can think of has a sense of humor quite as we do. Furthermore, this trait seems rather complex given the fact that a good joke relies on things such as timing, subject matter, and delivery, which only raises further questions about why we need so many factors to find something funny.

Any biology students willing to help me out?