Yeah, I knew it was familiar. Just re-emphasizing the importance.
A panda walks into a bar. He orders a plate of bamboo from the bartender and settles in to have lunch. Once he's finished, he pulls out a .357 Magnum, fires three shots into the air, and walks out. Another guy at the bar gives a WTF look to the bartender, who shrugs and hands over a wildlife book opened to the page on pandas. It says "eats, shoots and leaves."