Roller coaster

A roller coaster was, according to Peri a thrill ride. When Erimem was feeling particularly melancholy following wholly unpleasant events in the Himalayas during the time of the British Raj, (AUDIO: The Roof of the World) Peri offered to take her friend to ride some roller coasters the next time the TARDIS arrived on Earth. (AUDIO: Three's a Crowd)