This is a toy I learned somewhere as a kid. Now as my son is growing up. I make it for him.
Step 1: Materials
Thick straw (likes of the MC Donalds)
Pair of scissors
Step 2: How to Make
Start by making small diagonal cut on one side of the straw. And keep cutting into a spiral. Cut until about 1 or 2 inches is left intact of the straw. Now the straw will be wobbly. You are done!
Step 3: How to Play
Just keep the straw in your mouth and blow hard. The cut end will jiggle and dance.
Other options. You can use a blown up balloon as a air port and stick the straw in it. It works.