reset is your friend. Less so these days with GUIs where it’s often quicker to close the window and open a new terminal emulator, but still good to know about in a pinch. That rare occasion where you’re actually on a console and Ctrl-Alt-F# isn’t available, or attached to a remote session where disconnection might mean you can’t get back on, etc.

The man page suggests Control-JresetControl-J as the correct sequence to run it, because the Enter key might have had its behaviour altered. And if things are still slightly weird after the reset, run its parent tset.