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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Best Friend Wedding
Camera:
Lens:
Submitted: Monday, 27th June, 2011 16:01 (GMT)
Taken: Sunday, 12th June, 2011
Focal length: 50 mm
Shutter speed: 1/640 sec
Aperture: F2.2
ISO: 320
Notes: Nikon AF Nikkor 50mm f/1.8D
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