Conversation so far:
Who is uri Geller?
self-proclaimed psychic Uri Geller.
how did he know johnny carson?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Johnny had been a magician himself and was skeptical" of Geller's claimed paranormal powers.
did he call out geller?
Per Randi's advice, the show prepared their own props without informing Geller, and did not let Geller or his staff "anywhere near them..

Question: what happened?
Self-contained rewrite: what happened when Geller had to use props that Johnny's staff prepared?