The creature caused chaos on Saturday morning on the London Underground as it jumped around the train, causing passengers to squeal.
Passengers in the video are seen lifting up their feet and some appear to even cower as the squirrel charges around the train.
While many commuters screamed, one woman put her hand out to the animal and tried to coax it towards her.
The squirrel caused chaos on the tube
One passenger captured the amusing moment on video and posted it on social media.
Responding to the video, Facebook user Martina Forcina wrote: "Poor thing, hope somebody helps him getting out and safe."
Charlotte Brett-Hogan wrote: "I hope it's okay. Poor thing must've been petrified."
Passengers were shouting hysterically at the creature
And Lee Savage wrote: "Makes me laugh, everyone saying how the squirrel must be petrified.
"If so scared then why choose to get on a tube in the first place?
"It's all about choice and responsibility. You can't have your cake and eat it. You do the crime, you do the time."
The squirrel was jumping around the train
The grey squirrel was first introduced to Britain by the Victorians in order to adorn estates and gardens.
But they are now causing the retreating native red squirrel population to extinction.
Greys are out-competing what is left of the red squirrels and spreading the killer squirrelpox virus, which rapidly terminates reds but does affect greys.
The legal culling of grey squirrels remains controversial - although monitoring shows that cute reds quickly inhabit the areas cleared of greys.