Which word should I stress?! 

Speech therapists and communication coaches Sophie and Nathalie Cooper share a few tips on what words to stress in a sentence in English!
Full tongue-twister from video:
Betty Botter bought some butter, 'But,' she said, 'This butter's bitter! If I put it in my batter, it will make my batter bitter! (Sentence accidentally omitted from video:) But a bit of better butter will make my batter better.'
So she bought a bit of butter, better than her bitter butter, and put it in her batter and her batter was not bitter. So 'twas better Betty Botter bought a bit of better butter!