Since sponge balls are fairly easy to learn (at least the basics) many people pick them up and they focus on getting the moves right and they stop there. I went through about 10 the the clips associated with the first vid you posted earlier. There is one that is more of a collage of some very good magicians with little clips of their routines. One was a bar routine where he talked about standing the little guys on their heads, and ribbing their tummies. He actually gave the sponge balls characters of their own. So often they are just sponge balls.
What if you brought out a sponge ball by "accident" not as part of a trick. When you tried to put it away it kept reappearing. Perhaps it would even get larger as you fought with it trying to get it to go away. They you give it a karate chop to knock it out so you can put it away only you hit it too hard and now it becomes two of the smaller balls. The only way to put it away is if you can change the color of the balls. ...
Try to think of a situation or a storyline that is somewhat funny and then try adding the sponge balls. Sometimes working backwards is easier than frontwards (taking the balls and trying to create a funny story around them.
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