Enter the maze

USS Yorktown Stops, 1998

A big something caused by nothing.

Dividing by zero is a bad idea. The answer doesn't exist. However a crewmember of the computer controlled guided-missile cruiser USS Yorktown mistakenly entered a zero on their console. It resulted in the computer program trying to do an impossible divide by zero. The program crashed and caused a failure in other linked computer systems on the ship, eventually shutting down the ship's engines, leaving it drifting for hours.

The moral: always check numbers are as expected.