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Fun Fact: In the movies they had to dub Scotty's voice as he became more Scottish (and belligerent) in his old age.
(startrek.website)
Wae da Captain expect a miracle buh ma union sez ya git a break. Tha mi a' dol ga dhèanamh. Pog mo Thoin!
It was particularly notable in the episode where he had to scream, “Purple Burglar Alarm!”