He tells MTV.com, "I met Christopher Lloyd. I lost my mind. I turned into a schoolgirl. I started screaming in his face. I went insane. But I guess because his performances had such a profound effect on me, it was like meeting a hero."
But Garfield, who is set to play Spider-Man in the upcoming superhero reboot, hopes his movies won't attract any hysterical fans.
He adds, "I personally haven't been on the receiving end of that, thankfully. Maybe naively, I think my life is going to stay the same in terms of anonymity (after playing Spider-Man).
"I feel it's so important to have a normal life, to be able to walk down a city street and have a normal human experience in order to reflect that in the work. Otherwise, you can't relate. It's so funny how actors are perceived. It's craziness."