Between what two substances that you have ever experimented with, was there the biggest and most vigorous reaction?

Question: Between what two substances that you have ever experimented with, was there the biggest and most vigorous reaction?
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Asked by to Veronica on 23 Jun 2014. This question was also asked by .
- Veronica Celorrio answered on 23 Jun 2014:
  
  Hello there!
  
  Acid and water or a base have the most vigorous reactions without a doubt! However, scientists have a trick for this. You ALWAYS have to pour the acid on the bse or water, otherwise it will create an explosion!

Question: Between what two substances that you have ever experimented with, was there the biggest and most vigorous reaction?