Sometimes a pin wheel pops up on screen (mac book pro) and I can't do anything. Why does this happen?

Sometimes a pin wheel pops up on screen and it freezes. Why does this happen?

"the spinning wait cursor is displayed automatically by the window server when an application cannot handle all of the events it receives. If an application does not respond for about 2 to 4 seconds, the spinning wait cursor appears."
Read more here: http://www.macworld.com/article/151583/2010/05/spinningbeachballofdeath.html

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