There are a million reasons for a plane to be delayed, but a mouse spotting? That's something you don't hear every day. Passengers on a flight from San Francisco to London were all buckled in when they got word of a mouse on board. That apparently means they needed to move to an entirely new plane.
Getting everybody on another aircraft caused a four-hour delay, but most passengers reportedly preferred the switch to having an extra passenger on their long flight.
Source: Associated Press