Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
This would work fine, except in terms of success.

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Hoberman Sphere Sports Balls

Expand to ten times their volume for some reason.
 
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Maybe the baseball would pulsate between small and huge so the pitcher would have to time it so it's small when he throws it. Yea, that might be a thing. Or the soccer player needs to wait till it gets big to kick it.

It'd be covered with an expandable rubber coating so it wouldn't be all gridy.

doctorremulac3, Mar 05 2019

Hoberman Sphere https://www.youtube...eature=youtu.be&t=8
[doctorremulac3, Mar 05 2019]

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       How about just having an exploding ball? The pitcher could light the fust and would then have to time it juuuuust right.
MaxwellBuchanan, Mar 05 2019
  
      
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