PIC FROM MARK GARDNER/MERCURY PRESS (PICTURED: MARK GARDNER, 48, AND HIS DOG)This hilarious picture appears to capture the moment a squirrel was forced to knock on a window to ask for help when it was stalked by a fox.Mark Mason Gardner caught the amusing snap in his London garden last week and shared it online as the unusual pose amused him.The 48-year-old was left stunned when the image, accompanied by the caption if you could let me in... thatd be great, went viral and was shared 21,000 times and received 3,000 likes. SEE MERCURY COPY *** Local Caption *** PIC FROM MARK GARDNER/MERCURY PRESS (PICTURED: MARK GARDNER, 48, AND HIS DOG)This hilarious picture appears to capture the moment a squirrel was forced to knock on a window to ask for help when it was stalked by a fox.Mark Mason Gardner caught the amusing