Nitpick: With memory (un)safety, a crash is the optimal outcome when something goes wrong. The real problem is when it doesn't crash and the program continues on thinking everything is fine...
There's more extreme situations like Super Mario Land 2 for the Game boy where it's possible for the game to present it's own memory on the screen and if you understand how it works you can do things like ask the game to execute the ending sequence [0]. At it's most extreme a series of TASes was presented in 2017 wherein multiple different hardware systems were linked together via RCEs in different games to make a VOIP streaming setup from a bunch of consoles that don't actually have internet connections [1].
I'm sure there's all kinds of reasons this kind of UB is undesirable, and could be hazardous in some environments, but people have also done some really cool stuff with it!
[0]: https://www.youtube.com/watch?v=faiZgO35YaQ&t=0s [1]: https://www.youtube.com/watch?v=7CgXvIuZR40