The pair starred in the original Star Trek TV series and film franchise. Nimoy died Friday at the age of 83.
In the online conversation, Shatner revealed that he and Nimoy began to realize in the 1970s how much people loved their respective characters Capt. James T. Kirk and Spock. He also replied, "Of course!" when quizzed about whether there are any inside jokes only he and Nimoy would understand.