So let the sun shine in face it with a grin. Smilers never lose and frowners never win. So let the sun shine in face it with a grin Open up your heart and let the sun shine in. ~Let The Sun Shine In lyrics
Lennie's in the beginning carried around a dead mouse. He just liked to pet it because it was so soft. Although because Lennie was so strong he pet it too hard and killed the mice every time. "Trouble with mice is you always kill 'em.