Video Why is it Impossible to Tickle Yourself?

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In this video:

It’s very hard to tickle yourself because your brain anticipates things going on around you in order to help speed up response times. More technically, the cerebellum monitors body movements and can also distinguish between expected sensations and unexpected ones, generally resulting in diminishing or completely discarding expected sensations, while paying much more attention to unexpected ones.

Want the text version?: http://www.todayifoundout.com/index.php/2010/08/why-it-is-nearly-impossible-to-tickle-yourself/

Sources:

http://www.livescience.com/health/050628_brain_tickle.html
http://en.wikipedia.org/wiki/Tickling
http://www.msnbc.msn.com/id/3077386/
http://health.howstuffworks.com/mental-health/human-nature/other-emotions/question511.htm
http://news.softpedia.com/news/Why-Do-We-Laugh-28974.shtml
http://oreilly.com/pub/h/2832
http://faculty.washington.edu/chudler/funny.html