https://youtu.be/zQ3flwWP_cs?si=U8f_mhfB2gQ21ETZ
Rick and Morty crossover

https://youtu.be/X_TMtgjQuZI?si=ocvDn7epD1ets4Xw
I've never thought of it as one for some reason but the don't mine at night animation is a Minecraft crossover.

There were also some official transformers crossover comics but I haven't gotten round to reading those yet.