When viewing a burrito one notices there are two ends: The front end and the back end. Typically the viewer would have no idea which end of the burrito is front or back, therefore determining the burrito's left and right sides vary in relation to it's orientation on a plate. One must view the burrito as it's own entity therefore the burrito establishes it's own left and right sides, subsequently rendering the ability to to establish a burrito's left and right sides completely impossible.
J: Dude I'm fucking hungry.
E: Yeah man me too, lets see what's in the fridge.
E: Check it out man there's two burrito's left! Which one do you want?
J: Ummmm... I'll take the left one.
E: Good, the right one is bigger.
J: I meant left from the perspective of the burrito.
E: FUCK!!! you just blew my mind!(head explodes)