A grandfather does push-ups on a wooden plank in a living room and two young boys sit on the other end of the wooden plank and their grandmother pushes it down repeatedly like a see-saw.The wood breaks and the boys fall down and their grandfather falls and they laugh.
Two boys go up and down on a see-saw when the boy on the right flies out of his seat, flips over the handlebars, and lands on the bar between them with his legs flailed apart.
2 boys on see-saw try to go very high. 1 boy almost goes straight up in the air, the other boy falls off & the boy in the air face plants on the ground. Backyard.