When in the presence of others, do not touch someone's snack. It's not yours.
Unless explicitly offered or invited to do so, do not reach for someone's Doritos.
When offered a snack, do not make eye contact. It's distracting.
Graciously accept a snack, but avoid direct eye contact. It's a delicate balance.
When finished with a snack, do not leave the wrapper on the floor. It's not a trash bag.
Find a trash can and deposit the wrapper, lest the snack gods smite you.
For further reading, visit our Advanced Snack Etiquette page.