“Urrrhkkk...me hurt...insighde...me never want ta ride in bad thin agin...”— Chosen One
Auto-Doc Rodeo is a quest in Fallout 2.
Having an Intelligence of 3 or lower and a Luck of a 9, 10, 2 or 1 will grant you reward, depending on your Luck.
Go to the Auto-Doc in Vault City courtyard and select the option to "ride". To get another rank, ride it again.
Autodoc Raised Hit Points (II) or Autodoc Lowered Hit Points (II)