In the blockbuster 'Speed', a bomb on a bus is triggered to detonate if the vehicle slows down below 50 miles an hour. The premise, slow down and you explode, while making for a great action flick, also happens to have its cosmic equivalent.
http://ummid.com/news/2011/September/07.09.2011/tickking_bomb_in_galaxy.htm
http://ummid.com/news/2011/September/07.09.2011/tickking_bomb_in_galaxy.htm