The 5 year old, procrastinating in eating his grilled cheese sandwich. He had already eaten everything else on his plate. He picks up one of the halves of his sandwich and says "Look, this is an isosceles triangle!". I tell him, "Yes Michael, that is an isosceles triangle, it has two equal sides. Now what shape is it if you take a bite out of it?" He takes a bite, looks at his bite mark and says "A half of circle!" Me:"You are right your bite mark is a half of a circle, now eat the rest of your sandwich kid!"