This clip (and the others posted by 'ChristopherJSykes') are from the BBC show "Fun to Imagine". Been a few months, but I remember the 'Magnets (and 'Why?' questions...)' segment being particularly worthwhile if you're looking for good bang-for-buck timewise.

Incidentally, the guy releasing this also directed it.

Also in case you prefer text: http://varatek.com/scott/feynman_problems.html