Brady Bunch, The - Peter Hits the Grass Hard!!!!
In the episode "Sergeant Emma", when the whole family is coming back into the yard after the jog around the block, watch Peter and listen. If you watch and listen carefully, you can hear a thud when Peter falls and lands on the "grass". (the reason you hear that thud is because he is hitting the stage that is underneath the AstroTurf)
watch the episode, "Seargeant Emma"