How long were they in this store? Either Emily's boyfriend is a pun genius or they've been wandering in this godforsaken supermarket all afternoon. No wonder she's so annoyed, it's terrible to shop when you're hungry.
Most of his puns are about how pissed she is. She does almost laugh at when he holds up some creminis and says, "There isn't mushroom for more puns." Relax, Emily, he was just having some fungus. DAMMIT.