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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Why a prime? With a wonderful face like this to snap, the question actually should be why NOT? This is my wee kitty Angus, the first portrait taken with my Minolta 50mm f/1.7 I bought just over a week ago. Compared to the kit lens I got with my Sony A230....well let's just say it's like the difference between an AMC Pacer and a Porsche..there IS no comparison.
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Submitted: Monday, 27th June, 2011 21:37 (GMT)
Taken: Thursday, 16th June, 2011
Focal length: 50 mm
Shutter speed: 1/40 sec
Aperture: F3.2
ISO: 400
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