This always makes me laugh: http://www.youtube.com/watch?v=0cNgwoAl2SM He He He!
One of my favourite characters in a classic cartoon: http://www.youtube.com/watch?v=ZEyNgjul298
I also used to like the fundutational(?!) ones. Was an Oz cartoon called Bright Sparks in which a cartoon robot took 2 cartoon kids around the world explaining stuff to them, overlaying the cartoon on film footage. There was another one in which blood cells, etc. were anthropomorphised as different body functions were explained.
This is the basis of all my biological knowledge to this day!
"The best shield is to accept the pain, then what can really destroy me?"
http://garyufm.blogspot.co.uk