what would be a good, not too messy, safe experiment to carry out in a kitchen on father’s day?

Question: what would be a good, not too messy, safe experiment to carry out in a kitchen on father's day?
- Keywords:
  experiment,
  kitchen,
  messy,
  safe
Asked by slmg to Ian on 20 Jun 2011.
- Ian van der Linde answered on 20 Jun 2011:
  
  An experiment to see what the optimum amount of sugar is to get cupcakes to rise the best. It’s scientific, but it also leads to a tasty snack.

Question: what would be a good, not too messy, safe experiment to carry out in a kitchen on father's day?