A teen girl rides a skateboard down a hill and loses balance and runs off and then trips and falls.
A young girl snow sleds into a dog and the dog ends up on the sled with the girl down as they slide downhill.
An adolescent goes down a snow hill on his stomach and his younger brother jumps over him on their sled.
A man jumps onto an exercise ball at the top of a sand dune and he gets bounced off and falls down the hill.