Why should I buy a 50mm prime lens?

Challenge #5 in the Opportunities series. Hosted by juanlucas.
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I made a mistake... haven't bought a 50mm prime lens yet. Show me why I should buy it!! MANDATORY to indicate brand/model of lens used for taking the picture (of course, only 50mm prime lens for this challenge).
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Zeek the cat up close and personal
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Took this with the nifty fifty in low light. It helped that he stayed still. :)
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Lens:
Submitted: Thursday, 30th June, 2011 02:32 (GMT)
Taken: Monday, 30th March, 2009
Focal length: 50 mm
Shutter speed: 1/13 sec
Aperture: F3.2
ISO: 800
Notes: Canon 50mm f1.8 II
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