I attend the National University of Quilmes in Buenos Aires, where my first OOP course was taught in Smalltalk, specifically CUIS [1]. It was a lot of fun and a very nice introduction to object-oriented thinking.

As a curiosity, there are two "competing" sections for this subject: one that uses CUIS and the other one uses Wollok[2] (an in-house language). It's funny to discuss which one is better with classmates.

[1]: https://cuis.st/

[2]: https://www.wollok.org/