prank flash

prank flash

n
a short film or animation linked surreptitiously to an innocuous website, intended to shock unsuspecting and easily-offended users of the internet
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014