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Passengers on a San Francisco-bound British Airways flight were delayed after a mouse was spotted on board before takeoff.

Travelers were subsequently removed from the aircraft at London's Heathrow Airport and forced to wait for four hours as a replacement jetliner was found, NBC Bay Area reported.

Despite the inconvenience, some passengers saw the funny side on Twitter. One even questioned whether the rodent had failed to obtain a visa.

A Haiku



About to fly to SF

There is a mouse on the plane

We all must get off — Midland (@midlandsound) March 1, 2017

Just had my flight to SFO cancelled because of a mouse on board the plane. Could it not get a visa?? #britishairways — Mark Watt (@markwatt) March 1, 2017

I'm going to sell this to the movies. It can be the slightly more pedestrian prequel to snakes on a plane. Maybe this is what lured them on? — Midland (@midlandsound) March 1, 2017

“On this occasion there was one very small customer who we had to send back to the gate," a British Airways spokesman told NBC News. "We are sorry for the delay.”

Mice have been known to chew through aircraft wiring, with potentially dangerous results, according to Reuters.