What do Funyuns, soft-shell crabs, bananas and grilled cheese sandwiches have in common? They’re all ingredients in one or another of Phat Sammich’s 60 selections, a mishmash of retro and stylin’-five-years-ago sandwiches with a decided tilt toward the calories-be-damned. Yes, grilled cheese sandwiches are an ingredient. Open since 2009, Phat Sammich is the brainchild of Jeffrey McArthur, owner of Farmington Hills’ Grilled Cheese and Tomato Soup. It’s a small and simple spot with a cheerful staff, an exposed kitchen, counter stools for seating, and everything served in plastic; most business seems to be take-out. These sandwiches are tall.