What is your favourite demonstration to do with your pupils?

Question: What is your favourite demonstration to do with your pupils?
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Asked by WolvesForTheWin to Chris on 10 Mar 2016.
- Christopher Blanford answered on 10 Mar 2016:
  
  Hi WolvesForTheWin (Wolverhampton?)
  
  I love my fire piston: http://www.cochranes.co.uk/p474-217-hyman-fire-piston.htm
  
  Chris

Question: What is your favourite demonstration to do with your pupils?