You can make this yourself… using one image to create a cartoon using a masked overlay… creating movement:
Animated Optical Illusion! - Funny home videos are a click away
The video is 115 seconds long, and was found on metacafe. http://www.metacafe.com/watch/1300550/animated_optical_illusion/
A silent video that presents a puzzle, using matchsticks.
Weird Cow: Matchstick Puzzle - Funny video clips are a click away
The video is 78 seconds long.
A simple and colorful way to get milk to move with rainbow swirls. Would it work with soy milk or other liquids? The add-in appears to be ordinary dish soap.
The video is about 2 minutes long.
Amazing sculptures that move on their own… the creator of these is probably going to be a lot more famous, but for now he may need an introduction… Theo Jansen makes these in Holland:
Strandbeast - a beast (or beest) that walks on the sand, hoping to be a viral video star! More seriously, Theo has a website where an upcoming movie is referenced - strandbeest.com.
A ferro fluid is, well, watch the video and read the description under it while you watch:
definition “A fluid in which fine particles of iron, magnetite or cobalt are suspended, typically in an oil.” (from webopedia, and they were invented by NASA. Answers.com defines it as “A colloidal suspension that becomes magnetized in a magnetic field because of a disperse phase consisting of ferromagnetic or ferrimagnetic particles. “
Helpful video - not a trick, but a real technique.
No need to do 100 pushups a day.
This works - may have to review it and see that it really was in black and white all along.
An interesting illusion in less than one minute!
Cool Optical Illusion - Watch more free videos
An optical illusion movie…
Not sure how it was done… 
This one makes your eyes condition to temporarily see waves & blurs, after you stop watching the moving lines… lasts for a few seconds. Warning to those who are easily affected - click to another page. For everyone else, the video will make you understand how your eyes are not as reliable as you’d like to believe.
Try at your own risk.
Watch a painting get made, and remade, and evolve… until the final ending which is a bit of a surprise (but not shocking).
It sort of resembles a puzzle as it’s made, but the video & music is a nice 3 minute jaunt.