If you watch these both in succession you get a pretty decent effect... I've ran accross stuff like this one before, and it never ceases to make an impression.
Watch this:
http://www.break.com/index/the_earth_is_very_small.html
Then (and this one is far more impressive) watch this one (You MUST use Internet Explorer for this link or you won't be able to read some of the text):
http://atinyglimpse.ytmnd.com/