The one with the caterpillar (it's not a worm, it's the larva of an agave moth) is mezcal. Tequila's ugly little brother, it tastes like battery acid. Tequila is made from blue agave, mezcal from yellow. Poorer quality and rough as guts.
Drinking alcohol makes my stomach hurt and feel all bloaty before I can even get a little buzz now. I guess it's my body's way of telling me Margaritaville isn't somewhere I should be visiting.