20 minute crafter--Skateboard Swing!!
a skateboard (I waited to find one at goodwill and scored this one for $3!!)
rope (from Lowe's--pay attention to the weight limits)
a 3/8 drill bit (this was the biggest we had--we took it to Lowe's to match it to the width of the rope)
2 of those metal things--I have no idea what they are called but they are oval with a way to screw it closed
a dowel big enough to drill a 3/8 hole through
(Also, allow your three year old to drill at your own risk).