Bouncy castle

The Lady Cassandra compared the experience of possessing the curvaceous body of Rose Tyler to "living inside a bouncy castle". (TV: New Earth)

Jack Harkness and Ianto Jones were once allowed to play on a bouncy castle after saving a kid's party from dangerous Astracane leeches. (PROSE: Virus)

References in invalid sources
A bouncy castle was adjacent to the dodgems arena where the Fifth Doctor and Davros did battle. A helter skelter was also nearby. (NOTVALID: Doctor Who? 89)