Remember when Arnold Schwarzenegger pulled one over on Maria Shriver a few years ago, fathering a child out of wedlock with his housekeeper?
That wasn't cool.
But the former Governor of California fools people in the following video for a much better reason:
He's undercover at Gold's Gym in Venice Beach to raise money for After-School All-Stars, a nationwide program that provides free mentorship, homework help, tutoring and fun activities to students from low-income families.
It's pretty funny stuff, and it's educational to boot: Remember to drink A LOT of water, people!
Of course, this footage got us thinking: What has been the best viral prank over the past year or so?
And then that question got us working on the answers. Relive some of the most memorable jokes and pranks right now, slideshow style!