Well, one of the most common workplace mistakes, second only to spelling errors, is the accidental act of mixing things up. This list is a testament to that!
But to the employee behind this: when did a cherry slushy or any cherry flavored consumable become green? How did you mess this up? Well, either way, customers can still enjoy a good old brain freeze, and would probably not notice that their cherry slushie tastes a little bit like green apple.