Baaaaaa!

Benjamin has a new word. "Bye!" Except it comes out, "Baaaa!" Today we got home from the park and I took Benjamin out of the stroller. He made a beeline for the neighbor's yard, so I yelled, "Bye Benjamin, we're going inside!" He promptly turned, waved, yelled "Baaaaa!", and went into the neighbors garage. I'm not sure if he said goodbye or if he's just mocking me!