Upside Down Time Bomb

The Planet Express crew is sent to destroy a giant ball of garbage heading directly towards the Earth along with an explosive set to detonate after 25 minutes. Once they activate it, the digital timer counts down "25:00...15:00...05:00...6h:00" to the crew's surprise. The reason? The timer was upside down and thus set to 52 seconds instead of 25 minutes. Way to go, Farnsworth.

Example of:
Magic Countdown