Here’s another very well-known tongue twister and one that works quite well for my tongue. Does it work well for yours?

“Betty Botter bought some butter
But she said the butter’s bitter
If I put it in my batter, it will make my batter bitter
But a bit of better butter will make my batter better
So ‘twas better Betty Botter bought a bit of better butter”

(’twas’ is the short form for ‘it was’)