At 5:30pm pacific time on October 24th 2009, a new world record was set; world record for “Largest Simultaneous Thriller Dance” (multiple locations). I heard that about 50 000 people across the world did the dance at the very same time, yeah, people were up in the middle of the night in Europe and Asia to do the dance. In LA, they did the dance at Staples Center.
I have watched my friends practicing the dance steps for weeks, not dressed up as zombies though.
Michel Jackson himself did a guest appearance.
Here is a video of the dance.