Make sure it's actually hair. We had a dwarf NPC come into game a few months ago wearing one cut out from felt at like 3am on saturday night (you know when we're all tired and punchy) and I took one look at him and said "Pardon me, sir. Is that a beard on your face or are you slowly eating a muppet?" We had a ten minute hold because no one could breath we were laughing so hard, especially when about once a minute someone would walk in and say "What's so funny?" so we'd tell em, and then all lose it again.