My Friends Tigger & Pooh - Season 1 Episode 13 -

Pooh finds himself missing the "rumbly" in his "tumbly." He's just woken up from a long nap and found that it's missing. He calls on Tigger, Darby and Busters' help to get to the bottom of the problem. They first have to clarify exactly what it is they're searching for before they can start detecting.