If it's possible for Mac's face to retreat further into his neck and head, it's a medical miracle; the wince Mac gives as Nora swallows is basically biblical. She probably could have gotten less of a reaction wolfing down literal dogshit or expired Peeps. Mac looks almost offended by the fact that she's be so undiscriminating.

"It's a sickness where you die because your cells blow up and squeeze your organs out. Please</i< don't eat more of that."