Climbing up into the treehouse for the first time, Bobby slips, falls, and sprains his ankle. Greg starts to suspect Bobby is deliberately feigning prolonged ankle pain to avoid any activity that involves heights, and Mike and Carol notice that when Bobby comes downstairs for dinner, he's not showing any signs of limping. Bobby's fear is finally overcome when Tiger scares his parakeet out the window, and he is forced to rescue it.   "What Goes Up..." The Brady Bunch S2 E11, originally aired December 11, 1970 Advertising Inquiries: https://www.advertisecast.com/