It'd have to be pretty bad...
Just about two years ago I was involved in a pretty nasty car wreck. Got a helluva scar from my lower lip down past my chin and a nice big reminder scar where they had to insert a trach tube. Needless to say, I was way too messed up for a while to do the job (and the hospital had funny rules about my wife bringing my shaving equipment into the Trauma Ward). I had my wife shave me with my gillette superspeed for about a month...head (baldy) and face. Just couldn't do it myself.
-Pary