You know where's an excellent place not to have diarrhea? A hot tub. Particularly when you have two fun-loving ladies beside you, whose day is about to get memorable but for all the wrong reasons. The man's face says it all in the Imodium ad above. The anti-diarrhea brand has actually been fixated on hot tubs for some time. Check out the spot below from Canadian agency MacLaren McCann. See? Diarrhea is just bad form in group hot-water environments even if you're sharing the tub with a couple of dudes.