A cast iron bomb is completely filled with ice water, then placed into a dry-ice/acetone slush and covered with a wooden box. When the water in the bomb freezes, the cast iron bomb explodes, breaking into several pieces, and destroying the box in which it was placed.
A normal ice cube is less dense than liquid water, but a deuterium oxide ice cube is more dense than liquid water.
An H2O ice cube is less dense than liquid water, but a D2O ice cube is more dense than liquid water.
Introduction to the floating squares demonstration shows the preparation of the square of paper rubbed with graphite on one side.
A paper square rubbed with graphite on one side is placed at the interface between two immiscible liquids (carbon tetrachloride and water).