Here's one... fat slob/slobette (and I'm not talking about little kids) standing at the ice/soda dispenser having to add that extra 1/20 oz. to their cup. Add a little soda, slurp up the foam, add a little more soda, slurp up the foam... until until ~40 seconds go by.
Damn people, there's a bottomless supply of high fructose corn syrup... fill up your cup and sit your tail down so we can get ice for tea.