Random strange observation

Seen on the road on my way into work this morning:

I passed a bus going the other way. I noticed that it had a prominent sign over its front window scrolling, “NOT IN SERVICE.” We both stopped at the light, the bus on the other side going the other way from me. I then noticed that the sign switched to scrolling “GOD BLESS AMERICA.” It kept alternating between those two messages.

Make of this observation what you will. Was it a message? Or was it just strangeness?