Oh So Silly!
Every few months I {try} to take my children to the science museum in our area. If it were up to my children, we literally would be there every week. We go so much that some of the science experiments staff know us personally.
How can one not turn into a 10-year-old to test the Bernoulli principle by using a column of air to levitate a table full of sponge balls? By far a favorite exhibit of my children.
Of course, my daughter uses her face instead of the supplied balls. Go figure!