How To By Pass Sonic Wall At Work?

You could try to:

1. Open Run
2. execute cmd
3. ping www.youtube.com
4. write the IP down
5. and copy paste it in your browser

(If you want to skip all these steps, you could try to type in your browser this IP: 208.65.153.253.
It's YouTube's.
Or elses you could try doing it yourself for fun :D)

There is a case of nothing different happens...
I'm not really sure :p

Another solution is to go to YouTube from another place,
and search for: "bypass blocked sites" or something like that.
There are a lot of guys at YouTube with a solution to your problem.
Good Luck!!!