There’s nothing silly about the selection of beers and vegan snacks at Common Market, but nearly everything else in this South End deli/convenience store is a testament to the tongue-in-cheek. Try the bacon-flavored toothpaste, or the plastic mustaches. Need a bicycle bell patterned after the Liberty Bell? They’ve got it, along with candy you haven’t seen since childhood—from Mary Janes to Necco Wafers and “It’s a Girl!” pink-bubblegum cigars.