Yes. They will make a believer out of you. You will believe they made that sounds when you are washing snake and scrubbing bins. And yes, the "That's not healthy" thought is completely normal. The smug little look on their faces makes you believe that they feel much better!
My little guy must have had a "Dumb and Dumber" moment with the one guy on the toilet. Mouth open and shaking, the whole 9 yards.