 FAKE: When Doc is on the ledge of the clock tower near the end of  the movie, he pulls on the wire very hard to get it connected, but  you can see when he yanks it, it goes well beyond the point where he  could easily connect it to the plug, before it even detaches on the  other end at the lamp post. The wire then appears very taut after  catching the branch, yet he has more than enough slack left on the  wire to wrap it around the big hand of the clock twice and zip down  it.