The videos linked here show phase changes and properties of liquids, solids and gases that we don't usually see under "normal" circumstances.

 

Dry ice explosion:  http://www.youtube.com/watch?v=c8pIqqdHo3o&feature=related

 

Freeze water without temperature change: 

http://www.youtube.com/watch?v=pOYgdQp4euc&feature=related

 

Run across a liquid: 

http://www.youtube.com/watch?v=f2XQ97XHjVw

 

Pressure turns liquid to solid:

http://www.youtube.com/watch?v=0gi9xDgMVjI