The alarm on my bus goes Wa-Wa-Wa

Wow, today the bus I am travelling on has an alarm on the doors to signal that they are closing.

Tell me, do all buses have this?

I have no idea if all buses have this because I have never heard one before.

Today, however, I am sat on the top deck directly above the back doors of the bus, and sure enough, I can hear a kind of low siren thing whenever we stop at a bus stop.

It's most odd to be able to hear it. In fact, I nearly got up to leave the first time I heard it as I thought it was some sort of emergency alarm.

It never ceases to amaze me how I hear things the randomest of things sometimes and yet when I pick up the phone, all I hear is gobbledygook... I guess this alarm must be just the right frequency for me or something.

I wonder what else I will hear today...

Fingers crossed it'll be something good.