That's Lamby Lamb. MISTER Lamby Lamb to you. He is a lamb, but thinks he's a ram. He rams everything. EVERYTHING.
Mike says that ramming people in the FACE is his way of saying "hello," and also, "I love you."
But let me tell you - he KNOWS that it hurts when he rams me in the face when I am wearing my glasses. Oh, HE KNOWS.