AnimalsJokes Little Johnny In School Hands In A Blank Piece Of Paper. This Is Hilarious. Little Johnny in school hands in a blank piece of paper for his art homework. The teacher says, “What’s this?” Little Johnny says, “A picture of a cow eating grass.” The teacher asks, “Where’s the grass?” The kid says, “The cow ate it all.” “Ok, then where’s the cow?” “It left because there was no more grass.” See more Previous joke The Monkey Knows Everything. Next joke A Man Is Walking Through The Park.