I meet Christopher Lloyd in the summer at a convention and I asked him three times a question while he was signing some items for me and he must be going deft, as he couldn't hear the question and when I repeated he wasn't looking up and ignored me. He also needed some help with the signings picking a pen and where to sign. I had to say something and the assistant intervened to help. He looked and acted like he didn't really know where he was or what he was doing. This was towards the end of the day, so he may have been getting tired. I gave up with the question and was very happy for the signings, but also felt sad for him.