Trentatré Trentini entrarono a Trento, tutti e trentatré, trotterellando
Meaning: thirty-three people from Trento (northern Italy) entered Trento, all thirty-three trotting.
I first came across this tongue twister in the mid 1990s in an excellent BBC Italian course Italianissimo. Sadly, this no longer seems to be available.
Hi, Pete, I’m Juan Fº. You’ve got that programme in YouTube. Here is the link: https://www.youtube.com/watch?v=j_VBxRQpE68&list=PL6vl24IDcP3xbQ2aySZQyP32IqlSzLaer
Thanks Juan Fº for forwarding the link to programme 1 of Italianissimo on YouTube. When I have time, I’ll check which programme this tongue twister appeared in.