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Bulma shows Son Goku what a Hoi-Poi Capsule can do.

A scooter/motorbike style vehicle that Bulma popped out of capsule no. 9 in her capsule case, to replace her car which Son Goku wrecked. 

The scooter has two large wheels and a glass dome over the top. It is emblazoned with 'Capsule 9' and 'AF4029'. 

She rides with Son Goku towards the next dragon ball, when she has to stop to pee and is attacked by a pterosaur. Son Goku then uses the bike to launch himself so he can kill the Pterosaur and save Bulma.