Marvin Breed joins the choir on Hoenikker, calling him a, to paraphrase, weirdo.
John asks about Emily's memorial, but Marvin tells him that he didn't sell it to Hoenikker. The doctor didn't give a fig about adorning his wife's grave.
He sold the memorial to the children, who used their father's Nobel Prize money to pay for it.
John offhandedly mentions the fact that Nobel made his money selling dynamite.
If John had been a Bokononist then, he'd have thought, "[b]usy, busy, busy" (32.13). But since he isn't, he settles for life being funny.