A washing-up hum

I hum and sing a lot. This afternoon, while washing my lunch stuff at work, I had a little hum, which turned into a little sing. Luckily there was no-one around to hear, as it went something like this:

'Mmm mmm mmm, la la la,
How luckeee I am,
Living on the sea bed
In old Amsterdam.'

I'm just hoping it wasn't my subconscious having a global-warming related premonition.