What's that noise?

This morning I was sent Alex off to school with his friend.  They have been riding their bikes because the weather is still nice.  As I was in the garage saying good bye, I heard a strange noise outside.  It sounded like it was coming from above the house.  Alex's friend said, "There's a hot air balloon over your house!"  I heard a girl yell from the balloon to someone asking where they were going.  The person replied that they were going to school.  The girl in the balloon said, "So am I."  I ran in and grabbed the camera, opened the back door and took a picture of it flying over the neighbor's yard. What a way to travel!