The Czechs have historically had a fairly significant animation industry, and the vast majority are very cute, e.g.: [0][1]. There also exist a few stop motion animation films intended for adults, and those can be more arthouse (e.g. Alice). [2]

In America, Czech cartoons somewhat unfairly have the reputation for being weird, because a dozen Tom & Jerry episodes were made in Prague in the early 1960s in very weird circumstances, on a shoe-string budget by animators unaccustomed to the very idea of violent cartoons. [3] These were received with some confusion by the American audience in the midst of the Cuban Missile Crisis. From this you then have consequent parodies like The Simpsons' Worker and Parasite, which - though not exactly a fair reflection of Czech animation - is absolutely hilarious. [4]

[0] Krtek a telefon / The Little Mole and the Telephone : https://www.youtube.com/watch?v=RYwrCTxF9Oc

[1] Krtek chemikem / The Little Mole as the Chemist : https://www.youtube.com/watch?v=h8xO4PiJ--w

[2] https://en.wikipedia.org/wiki/Alice_(1988_film)

[3] The story of this is told here: https://www.awn.com/animationworld/tom-jerry-produced-prague

[4] https://www.youtube.com/watch?v=z2_dhUv_CrI

The brilliance didn't only extend to animation - there were at least a dozen of non-animated fantasy and science fiction series some that were produced together with the German PBS. For instance Adam84/The Visitors (https://en.wikipedia.org/wiki/N%C3%A1v%C5%A1t%C4%9Bvn%C3%ADc...), Arabella (https://en.wikipedia.org/wiki/Arabela_(TV_series)) and Pan Tau (https://en.wikipedia.org/wiki/Pan_Tau). The visitors in particular have a banging soundtrack you can listen to it on YouTube.

Who can forget "Worker and Parasite"?

https://www.youtube.com/watch?v=z2_dhUv_CrI