It's not very hard to build a keylogger using basic pic chips and install them into a keyboard. The same could be done against a dumb terminal. For bonus points

It's not very hard to build a keylogger using basic pic chips and install them into a keyboard. The same could be done against a dumb terminal. For bonus points, put a bluetooth module / picoduino inside so that you can read out people's keystrokes without touching it again.