The version I read was a 'Panda' joke, playing upon grammatical ignorance.

This Panda walks into a bar and orders a series of sandwiches.

The Panda turns to leave, but before going, he shoots one of the bartenders. The Panda is caught before reaching the door and is asked why it killed an innocent worker?

The Panda produces a dictionary and tells the posse to look up Panda:

Eats, shoots and leaves