thanks for all the suggestions for how to break my terminal, here are the ones that have worked for me so far:
1. start a less capable shell (like dash), then `cat /usr/bin/vim` (screenshot included)
2. start `screen` and then `kill -9` it. Breaks my terminal in a way that can't be fixed with `reset`.
3. start `htop` in bash/zsh and then `kill -9` it. Causes using the mouse to print control characters. (doesn't break in fish though)
4. killing almost any TUI app in bash/zsh seems to break it