It seems that YouTube is down in Pakistan. Possibly it is blocked.
Blocking websites is a rather bad habit that the government authorities in Pakistan have gotten into (here and here). This is something that we have written about before. It is silly habit, because technologically it does not work. But, much more importantly, it is a disturbing habit because it points towards a desire by those in authority to “control” the passions of the public. Democracy demands the very opposite - that the people control teh passions of those in power.
But the real question is, that if YouTube is blocked, then why?