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Step 1: Get the Stuff
To make a tennis ball safe, you will need: A knife A piece of paper A tennis ball A baseball display case
Step 2: Cut the Hole
Take the knife and cut a hole about 3 cm. by 5 cm. Then you can either keep the piece you cut out and save it, or you can trash it. The option is yours
Step 3: Enter the Money
Then take the money and drop it into the hole. Then take the paper and rip it into about 5-6 pieces, and stuff it into the hole. After that, just set the finished piece in the display case (hole side down) and put the lid on. Nice!! Please note that I am NOT RESPONSIBLE for anything you decide to do with this thing