I have no proof of this, but it comes from a reliable source (well, someone I consider reliable).
meth
Mythbusting: Does Home Depot Have A Meth-Lab Aisle?
Burger King: Would You Like Meth With That?
If you need another reason not to eat fast food, here it is: A manager of a California Burger King was caught using the drive-thru to sell methamphetamine. The customer would place their food order (and their drug order) through the drive-thru ordering system and manager Michelle Filby would fill it.