What's the ad?
Snow White relents and says "When I get into the water and you hear the splash, you can turn around." Snow White undresses and as she is about to jump into the water, at that very moment, she is startled by a frog who jumps into the water before she can. The moment the Dwarfs hear the SPLASH, they turn around and see Snow White standing NAKED.
Now, given that this incident is an idea for a TV ad, what product is being advertised?
That's easy ... Seven-Up!