Sad Strawberry

Alright listen up, buttercup. This joke is playing on the words "feeling blue". "Blue" is a color, genius, and also means feeling sad. So, if a strawberry is sad, you can call it a blueberry, because blueberries are blue, and also because "blue" describes being sad. You probably think that asphalt is a food group, but you are wrong! The food group is obviously cement!