Possibly a re-post, and most likely fake, but whatever.
Why it's probably fake:
-girl dressed way too "sexy" compared to area she's walking through (see what others are wearing)
-girl doesn't notice the "weird" looking guy walking behind her in a hoodie
-girl stays after he says "hold on a sec" but was adamant on leaving and walking away after the first 2 requests
-use of "as a matter of fact"...who talk like that IRL?
-no one would throw a stock of large bills at someones face and just walk away, and no girl would be impressed with a stack of 1's.
Unless of course the "prank" was for those watching the situation.