Periodic Table of Videos
The University of Nottingham chemistry department has a great website with videos for each element. Check it out at Periodic Videos.
Here’s their great video about cesium. There’s a very famous video where a few grams of cesium destroys a bathtub when dropped in water. Obviously, as is proven by these professors/researchers and the Mythbusters, a few grams (even 25 grams, in the Mythbusters’ case) cannot blow up a goldfish bowl, let alone a bathtub.