I remember an article he wrote about writing for Star Trek and how William Shatner came over to his home on a motorcycle and spilling it on his driveway leaving a mark that he still sees.
He said Shatner was counting the number of lines he had in the script compared to the other actors which made Ellison very mad.
I read that same article. Line counting was common back then with some actors. They wanted to have the most lines. Ellison believes Shatner was upset because Nimoy had more lines than Shatner did. Considering Shatner’s ego, that might well be true.