Okay, so I may be a little late to the game on this one (considering about 12 of the 24 hours have already elapsed) BUT this is the coolest thing ever.
Pharrell Williams is currently streaming a 24 hour music video - 24 Hours of Happy - that basically consists of all these awesome individuals dancing their hearts out to the length of "Happy" in various locations. Okay okay, the song might get a little repetitive, but watching these people really does make me unbelievably happy. What's even more fun, the people around them are totally oblivious to what is going on.
Tune in here: http://24hoursofhappy.com/
Tune in here: http://24hoursofhappy.com/