Surfing

Surfing was the use of a board to move on liquid. The Fifth Doctor asked Tegan Jovanka if she had ever been surfing. She replied in the negative and returned the question, to which he replied "not on the sea". (AUDIO: Eldrad Must Die!)

To escape the Sontarans, the Eleventh Doctor surfed on the lava of Florinall 9. (WC: Pond Life)