Balloon Yo-yo (aka homemade punch balloon or ball)
Inflate & tie balloon. Leave a long "tail" (little piece below knot).
Loop seven inch long rubber band (rubber band size 117) around knot.
Pretend balloon knot is one shoelace and rubber band is another shoelace. Tie together twice as you would when double-knotting a shoelace.
Play with balloon yo-yo by looping rubber band around finger and bouncing against palm.