A panda enters a pub. It orders a sandwich, eats

Question

A panda enters a pub. It orders a sandwich, eats

it; at the moment of paying, he take out a gun and proceed to shoot the other patrons before proceeding to the exit.

A surviving flabbergasted server ask the panda:

"Why?"

The panda hands him a zoology book with terrible punctuation.

"Look it up, I am a panda"

And indeed, at the page for the panda it reads "Large bear like animal from China. Eats, shoots and leaves"