One time at work I was complaining about having to use old computers instead of expensive, cutting edge ones I named them “stoneknife” and “bearskin”.
Besides the Joan Collins episode, my favorites are The Trouble With Tribbles (great humor), Mirror Mirror (Kirk, Spock, McCoy and Uhura encounter their evil doubles), and A Journey to Eden (space hippies take over the Enterprise, where Spock joins the protesters in a love fest concert.)