Damn straight young jedi!
I once was at a sandwich place and the girl making sandwich sneezed into her hand then started to make my food.
Now I am not one to hold back, so said "excuse me, I think you need to wash your hands and make me a new sandwich"
She was pissed! I walked out and ate elsewhere.
Someone sneezes on anything you're about to consume, say something or just ewwwwwwwwwww!