What is the cat doing in the garage?

This morening, when I was leaveing for school, I opened the garage door and steped out and heard purring and felt something rubbing my leg? I looked down and saw Shankie was in the garage. What is the cat doing in the garage. I sat and petted him, makeing sure I didn't touch his wounds. "You silly cat!" Turns out Mom had left the garage door open. I took him the fence and said "up." He jumped onto the fence, and then climbed in the backyard. I went into the backyard, and help him get down (he has a hurt paw, the poor thing) and gave him some food. When I left he was very happy.