A passenger on a domestic flight in China opened the emergency exit as the plane was preparing to take off. The first time flyer (it's always the newbies) declared that he wanted some fresh air and wrenched open the over-wing exit on the Xiamen airlines flight.

To Xiamen Air's credit, they seem to take it all in stride: 

“It was his first travel by air,” an airline staff member told the paper. “He did not cause delay or any other direct loss to the airline.”