If you've ever been told not to jump on your bed - this one's for you.
850 people in New Orleans in the United States have broken the World Record for mattress dominoes.
After all the human dominoes had fallen, all the participants even got to have a little bounce!
The last record was set at 550 by a group of people in Belguim in 2011.
Something like this should not be tried without proper safety precautions.