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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Olympus Zuiko 50mm2.0 Macro
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Lens:
Submitted: Thursday, 30th June, 2011 14:59 (GMT)
Taken: Thursday, 18th November, 2010
Focal length: 50 mm
Shutter speed: 1/400 sec
Aperture: F4
ISO: 100
Notes: Camera: Olympus E-519 Lens: Olympus Zuiko 50mm2.0 Macro Exposure: 1/400 at ISO 100, F/4
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