Who are adults kidding: bathroom humor is universally effective in eliciting laughter, and six-year-old's are professionals at it. That's what one Twitter user, Anne B, found out when her nephew got his potty-obsessed little hands on his parents' shopping list. What starts out as a normal list of grocery items (except, what is "kids bread" and why is it different than "our bread"?) sharply careens into a body-humor tragicomedy.