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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In a Summer day..
by Raj0709
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Trying to have a handful of water from an almost dried up tap..
Camera:
Lens:
Submitted: Monday, 27th June, 2011 18:00 (GMT)
Taken: Saturday, 19th March, 2011
Focal length: 50 mm
Shutter speed: 1/400 sec
Aperture: F3.2
ISO: 100
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Views: 440
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