
If your kids aren't old enough to shower on their own, yet, mark my words: The day will come when you find yourself bemoaning your water bill. Kids left to shower without supervision (I'm talking about ones old enough to know better, y'all) are prone to spacing out and answering your half-hour-later call with "I'm just about to shampoo!"
And then your head will explode and you will die, but it saves you from the coronary the water bill might've caused.
Get yourself a handy little Ripple shower timer, though ($16.26 for various designs on the company website), and stroke out no more. It's waterproof, steamproof, and dawdle-proof. Set it and let your kids race the clock. They'll think it's a game, you'll think it's genius.