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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Wifey
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Konica Hexanon 50mm 1.7 Midsummers eve, my wife in her excellent 60s outfit!
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Lens:
Submitted: Wednesday, 29th June, 2011 19:17 (GMT)
Taken: Friday, 24th June, 2011
Focal length: 50 mm
Shutter speed: 1/4000 sec
Aperture: F1.7
ISO: 200
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