Step 1: Watch this project until the end. Step 2: Remix this project. Step 3: Make it weirder. Step 4: Name it appropriately: "Scratch Tennis Part 2" Step 5: Wait for someone else to repeat steps 1-4 with your project. Step 6: Bask in the glory of eternal weirdness. (and maybe remix their project)
Credit to @Minirag for the Smooth Glide