Star Trek premiered in 1966 and turned Nimoy into a legitimate star. Nimoy always stayed active as an actor, but his role as Spock on the television show and the Star Trek movies over the years dominated his reputation.
Port Angeles Spec Ops Urban Drill - "Colonel Roy dumbass Potter? Shithead... Do you do videos like your dumbass friends? I see you're spewing garbage all over the place like them... Obama and the government is to blame for everything going on in your life? I say again and I will keep saying it again... You are a creep and are creeping all over the internet... If you do not like the United States of America... Leave it's shores, since the government is to blame for everything in your life"
Or just an illness that all starship captains are afflicted with causing them to talk dramatically in their heads seeing as Spock and Scotty also keep captains logs when they are temporarily in charge :P