You know, I just tend to grow my beard out for 'Parks and Rec.' As an actor it's always easier to shave or cut your hair for a role, but it's hard to put fake hair on or grow hair for a role. When you look at pictures of me, the longer my hair is, the longer my facial hair is, that's just the longer I haven't gotten a job.
The key is just to ignore the pain, because physical comedy only works if you see someone get hurt and they aren't actually hurt. If someone gets hit in the face with a bat, falls down, and gets back up, it's funny. If they stay down and their jaw is wired shut in the next scene, it's really tragic and weird. You have to pretend it doesn't hurt.