Decades ago, April Fools' Day was a barrage of whoopee cushions and "Is your refrigerator running?" prank calls. They got old quickly and left pranksters longing for more sophisticated tools to execute the most evil of gags. Enter technology. SEE ALSO: 50 Amazingly Epic Pranks The ultimate jokesters now have mobile apps at their disposal to ensure that hijinks are original and perfectly tailored to prank victims.