So I say to the other half of my Pair, "Gimme that f**kin keyboard!", as I rip it out of her hands and get down the the real work of systems development.
My co-worker, with whom I have design disagreements, is on paternity leave for 4 weeks. While he is gone, all of the bad code is deleted and completely replaced with something different.
This reminds me of the SaturdayNightLive? episode...
<Looking over someone's shoulder> "Look, just type the... here, you have to move the... just click on the..."
<breathing out in frustration> "MOVE!"
(It's brutal if you physically push them from the chair to the floor. ;-)