A pilot’s spilled coffee accidentally triggered a hijacking alert and caused a United Airlines flight from Chicago to Frankfurt, Germany, to make an unscheduled stop in Canada.

A Transport Canada report said United Flight 940 was diverted to Toronto late Monday and landed safely at Pearson International Airport. The coffee spill caused distress signals to go out, including code 7500, which means hijacking or unlawful interference.

via Spilled coffee forces United jet down early in Canada | News Bizarre | Chron.com – Houston Chronicle.