The same reason they don't swing from trees. Because they're dead.
Have you inquired of your ancestors? Madam Z tells me that she could run a seance at a cut rate for you.
'scuze me, Boss. I'm goin' out to check on th' pigs.
Bubba
What the heck!?
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them