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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"Through the bars!"
fire
Dance Recital 2011
Do not disturb !
Gavin+Bokeh
Fall Colors. SMC Pentax-M 1:1.7 50mm
Au Lac Vegan Salad Roll
colorful
portrait 3D
Gabrielle
Indoor Smoking Ban
Starbucks
She's not kidding.
50mm prime lens at night-5609
IMGP6691
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