When carrying the travel mug full of hot-as-magma coffee in your right hand, and the thermos of milk (which you just added chocolate syrup to) in your left hand, PLEASE remember which one you should shake.
When carrying the travel mug full of hot-as-magma coffee in your right hand, and the thermos of milk (which you just added chocolate syrup to) in your left hand, PLEASE remember which one you should shake.