Photo: David Clugston This looks like something fun you can build for/with your dad on Father's Day weekend: Adam Savage of Mythbusters built his own hovercraft out of plywood, leaf blower, shower curtain, duct tape (of course), and my favorite part, lawn chair! Wired's GeekDad has the instructions: Link For the rest of us who don't know the difference between a drill and a hammer, there's always the easy way out: Father's Day gifts from the NeatoShop...