Ooooh...Rubber Ducky, You're the One....
These aren't just any rubber duckies, they're glowing, dancing rubber duckies. These "I Love New Yoku" duckies (sounds like "I love New York," but New Yoku (nyuyoku) in Japanese also means bathing) have LED lights embedded in them that make them glow in dimly lit relaxing bath rooms. They're also wind-up toys, so you can wind them do dance to your rockin' mood music. They're 8x7x6cm, available in many colors, including the most popular yellow and white.
If rubber duckies aren't your thing, the frogs are even cooler and come in more colors.