Best Scotty line:
“The more they overthink the plumbing, the easier it is to stop up the drain.”
https://www.youtube.com/watch?v=T2NsTi_43g4
“Captain, There be Whales Here!”
I think my favorite Scotty scene is where part of the crew had been on leave at some space station and they had all gotten into a fight.
Kirk went down the line asking each man why they had fought. Each one gave some variation of the other side talking trash about Kirk.
When he got to Scotty he said (paraphrasing here) “Captain, I took all that and held the lads back. But when they called the Enterprise a garbage scow it was more than I could take!”
The Trouble With Tribbles I think was the episode.
I was in an online chat with his son, Chris, a few years back, and I asked him if his father was as mechanically or technically inclined as his character Scotty was. Chris texted me a link to a pic of his father under the hood of his British roadster, wrench in hand, covered in grease. *chuckle* He also didn’t have any kind words about Shatner, either. The dislike between the two men was real, and ‘the hatchet’ wasn’t quite as buried as is publicly stated. Chris said that at his father’s final convention appearance (he was in a wheelchair and was pretty feeble), Chris said he was standing within earshot when Shatner initially balked at a group photo with his dad because he ‘didn’t want to be around someone dying’, but finally relented.