I’m about to blow chunks!
If you find yourself in a department store and want to leave immediately, but the masses of shoppers are blocking your way, try screaming that you’re going to vomit. That’ll get everyone’s attention!
No one will want to get close enough to check you for symptoms of food poisoning when they hear the word ‘vomit.’ They’ll part ways faster than the Red Sea did. Furthermore, after they realize that you were lying about being sick, they’re not going to try and catch you because they don’t want chunks hurled all over them.