It's hard to be sensible and noisy at the same time.
The Original Potty Piano
The Original Potty Piano. Big Mouth Toys. The Original Potty Piano features 13 keys that allow you to drown out the less pleasant noises that often resonate in the lavatory. It even comes with a bonus song book with applicable hits like "twinkle, twinkle little star!". from Coolthings.com.au
Silverlit Chimpy. Silverlit. Dance, play with and tease your favourite new monkey pal, Silverlit Chimpy! Chimpy is your robot monkey friend with moving lips. He's a total hoot with his wild and funny noises! Complete with 3 touch sensors for sound and movement, you can make Chimpy dance, shuffle on his head and even fart unexpectedly! from Coolthings.com.au