What is the ‘Undead limb’ being referred to?

Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.   I always have catastrophes when I travel. Once on an airplane, I leaned over to tie a shoelace just at the moment someone in the seat ahead of me threw his seat back into full recline, and found myself pinned helplessly in the crash position. It was only by clawing the leg of the man sitting next to me that I managed to get myself freed. On another occasion, I knocked a soft drink onto the lap of a sweet little lady sitting beside me. The flight attendant came and cleaned her up, and brought me a replacement drink, and instantly I knocked it onto the woman again. To this day, I don’t know how I did it. I just remember reaching out for the new drink and watching helplessly as my arm, like some cheap prop in one of those 1950s horror movies with a name like The Undead Limb, violently swept the drink from its perch and onto her lap.