The Swan applet

 
Applets are normally named something.class and do cunning things which would not be possible using normal HTML code. This one is one of the classics with a rippling lake effect.

This applet is one of a number available free from http://www.demon.co.uk/davidg/spigots.htm and there is a cunning feature in the applet that takes you to his website if you right click in order to copy it. Before trying to use it, read the instructions carefully on the davidg website.