The panda eats shoots and leaves.
The panda eats, shoots, and leaves.
Grammar is very important because it can significantly change the meaning of your sentence if you leave out things, even if it's just punctuation.
A panda walks into a café. He orders a sandwich, eats it, then draws a gun and proceeds to fire it at the other patrons.
'Why?' asks the confused, surviving waiter amidst the carnage, as the panda makes towards the exit. The panda produces a badly punctuated wildlife manual and tosses it over his shoulder.
'Well, I'm a panda', he says, at the door. 'Look it up.'
The waiter turns to the relevant entry in the manual and, sure enough, finds an explanation. 'Panda. Large black-and-white bear-like mammal, native to China. Eats, shoots, and leaves.'