What metaphors are used in Slapstick: Or, Lonesome No More! by Kurt Vonnegut?

Metaphor:

"They were innocent great apes, with limited means for doing mischief, which, in my opinion as an old, old man, is all that human beings were ever meant to be."

""Please, brother Wilbur," she said, "this is Eternity here. This is forever! Where you are now is just nothing in terms of time! It's a joke! Blow your brains out as quick as you can.""