Beg for it? Begging for 6 hours in a high trafficked street may get you that, depending on where you live (US versus India for example).
Hahaha
Play an instrument or something in a high trafficked street, people give you money.
Rob someone or someplace or something.
Borrow from friends/family, never pay them back (or pay them back after you invest the $50 - I suggest putting it on red)
Offer to work for 15 days for someone, but they have to pay you $50 now. Technically you'll make the $50 within a few minutes/hour.. but you'll have to work it out later... unless you're a cunt and you just take the money and don't follow through on your promise.
Offer on Blackhatworld or some other forum or something to write articles.
Suck dick, take it up the ass, etc.
Climb a tall building and make a scene threaten to jump unless you're given $50 bucks (disclaimer: you may end up in the nuthouse or dead)
Find girlfriend, steal money from her purse.
If you're a chick, find boyfriend, take all his money, claim you were raped, he goes to jail to get raped, you enjoy the money. Rinse and repeat.
Making money is so easy. I use one or more of these methods every day. I'm very financially comfortable as you can understand.
Good luck!