While some guys became embarrassed once they realized it was a guy's butt they were oogling at, others chose to get defensive, some even ready to fight to uphold their manhood.
See why this prank is becoming the top viral video of the week.
Discover how Halloween began with this short video produced by TIME Magazine.
We've never seen anything like this in our entire life.
We dare you to make one and share the results with us!
What language is he even speaking?
The reason she does this is AWESOME.