I know that soda cup- they pump that crap into you at a Taco Bell.
I forgot to mention going through the Burger King drive thru and buying the largest coke they had at the time (early 80's). We'd proceed to the Char-Pal liquor store on Busch Blvd (which was the inspiration for a scene in Goodfellas) and bluff our way into a bottle of Southern Comfort. We poured out half the Coke and topped the cup off with whiskey. We hit the road with those drinks in a '66 Mustang and headed to the phosphate pits to meet our friends.
Good times. Southern Comfort never tasted so sweet.