would somebody waking up at there funeral be a big waste of money?

Depends on whose funeral it is.. ;)

Watch a movie called The Shipping News.
In it there's a scene where at the wake for a man who was found drowned at sea, suddenly wakes up in the middle of it !!
Brilliant !

Better at the funeral than once in the ground

Depends on who is paying

Depends on how much I want them gone

well the body is embalmed so they would have died from that so no wakey wakey at the funeral.

It would be a good reason to run for your life

Not if we kill them