The first time I sprayed the Elmo foaming soap, Gracie and Luke jumped about 3 feet. It wasn't that loud; it was just as loud as spraying hair mousse into your hand. However, it was a new sound to them and it was startling.
The Elmo soap has become a staple at bath time. I spray different shapes on the wall, usually a happy face or a heart, occassionally I'll even write "I <3 You." I'll spray it on the wall and the Twinsies will run their fingers or hands through the soap, destroying my picture. It's loads of fun. We used the last of the foaming soap tonight and had some fun.
I'm trying to decide if I should buy more foaming soap. After all, it is very fun. My newest toy is the fizzing water color. I can't resist dropping the little fizzing pellets in and watching the water turn red, blue, or (gasp) yellow!