Why should I buy a 50mm prime lens?

Challenge #5 in the Opportunities series. Hosted by juanlucas.
Challenge has finished
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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Niall
Sad Dog
Posed to a prime lens..
Zhivan
Plaza view at dinner - Ecija Spain
Shelby Cobra Badge-real deal
IMG_9305
Festival of Lights
2011-06-08 (9)
Corn Poppies
rose for bride
ammo
To bee or not to bee
6 / 7
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