In response to your final question, I believe Norris McWhirter's "Amazing book of unholy fiends for Kids" holds the answer:

"Reanimated skeletons are often known to cackle in a fiendish, and unholy, manner by the simple act of working their unfleshed jaw up and down whilst simeltaneously going "Muahahahahahahahaha!"

In addition to this, the skeleton can wave a sword threateningly as he does so, and say things like "we've got plans for you, girly-girl."

Bo"of course that book exists - I got it off of Amazon..."urne