[Sherman Logan]

Nahh, they’ll just piss in your coffee.

[Gaffer]

It’s why I avoid McDonalds and the Jose/Maria Spit Burger Big Mac at McDonalds..

[publius911]

Nahh, they’ll just piss in your coffee.

Fortunately, in the Starbucks model environment, that's physically impossible.
Perhaps you're speaking metaphorically?