Binge watch time
I actually remember the Perry Mason appearance and the Mission Impossible series due to my habit of watching old TV late at night while deleting junk mail. Leonard always made a character worth watching.
I usually don't like the comedy stuff, but the Big Bang Theory appearance was very well done. Because it was really an homage to the cultural icon nature of Star Trek without the overbearing fan boys trying to get too much out of it, I will admit it was good for sci-fi as a whole.
Something like this one: https://www.youtube.com/watch?v=WPkByAkAdZs
I'm going to miss Leonard Nimoy too.