What are some good experiments to do with bottles?

Question

What are some good experiments to do with bottles?

Answer 1

throw it down from top of a truck

a full bottle

Answer 2

Measuring to see how much CO2 is released from a soda bottle and whether there is a difference between hot and cold soda, diet and regular.  It is a good experiment, you get to shake the soda bottles for intervals of time and try to open them without letting the fizz overflow.

Answer 3

coke and mentos