http://video.google.com/videoplay?docid=-8568478827662499191&hl=en-GB
Sorry for the misleading title, but I couldn't resist.
Now, while not necessarily inflation, this is a really cool video.
Super slow motion video of a water baloon being popped.
Also, a good resource for all of yous who are looking for some neat imagery for stories and art.
Now if i could just find that Bill Nye one with the hydrogen balloon and the match...