From an essay by Penn of Penn and Teller:
No matter how much I want to brag, it’s overstating it to call [Richard Feynman] a friend. I would never have called him to help me move a couch. I did, however, call him once to ask how we could score some liquid nitrogen for a Letterman spot we wanted to do. He was the only physicist I knew at the time. He explained patiently that he didn’t know. He was a theoretical physicist and I needed a hands-on guy, but he’d try to find one for me.
About a half-hour later a physics teacher from a community college in Brooklyn called me and said, “I don’t know what kind of practical joke this is, but a Nobel Prize-winning scientist just called me here at the community college, gave me this number, and told me to call Penn of Penn & Teller to help with a Letterman appearance.”
I guess that’s close to a friend.