The poor man’s vi mode is for those who crave a more faithful vi emulation:

From: ErikNaggum
Newsgroups: gnu.emacs.help,comp.emacs
Date: 25 Jul 1996 00:38:58 +0000

you can change the global-map with the function `use-global-map', even if
this is probably a very bad idea.  e.g., you can do this to get  into "poor
man's vi-mode":

    (use-global-map (make-sparse-keymap))

like vi, it will beep at everything you do, and you can't quit.
have fun!