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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Eyes
In a Summer day..
Colors
Eight and a Half Months
only a fast prime can tell such a story
Dahlia ofter rain
Walking on the snow
Pia at 50mm
Eagle
The boy
Mother_and_Son
5 candles
Viki
The sounds of Bourbon Street
ALL THE BETTER TO SEE YOU WITH...
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