Question: There's this cool thing where you can stretch a picture out of shape. Where can I get it?

This is an effect created by an applet. You can download one at Anfyteam (see below) in its collection of freeware applets. You can also download one at WsAbstract.
 
 

Resources:

Anfyteam
This site offering a collection of freeware appplets counts the "smooshing" applet as one of them.

WsAbstract (Javascript Kit)
Offers the "goo" applet in which visitors can smoosh an image out of shape and reset it.