A tongue twister in Italian:
Trentatré Trentini entrarono a Trento, tutti e trentatré trotterellando.
(33 people from Trento entered in Trento, all 33 of them did so jog trotting)
This one is a tough exercise for language learners who are not accustomed to pronouncing the thrilling R sound, although it’s also somewhat facilitated by the presence of the T sounds that bring your tongue to the right position for the R thrillings :)