I've had part of a song in my head almost all day. What is it about certain songs that they just infiltrate your conscious mind and take up residence, like that unwelcome guest who kicks off their muddy shoes on your newly washed floor, and sits down in your favourite chair?

Dum-de-dum-de-dum (I don't remember the first line, all I have is the tune),
Jacques Cartier reached Canada's shores.
He saw a land of rivers and snow,
He wondered which way those rivers did floooooooow...

So he explored in a

Ca-noe, ca-noe, can you ca-noe?
Ca-noe, ca-noe, can you ca-noe?

I can think of several improbable reasons why this song, which I have not heard in well over a decade, decided to move in today.

• I'm regressing back to a simpler time, when I had fewer responsibilities and had other people to take care of and worry about me.
  
• I have water on the brain. Do you think they rent out canoes in the Caribbean? I know there are free paddleboats at the resort...
  
• I have a sudden subconscious urge to find out more about Jacques Cartier.
  
• No, wait, it's not Cartier I subconsciously want to find out more about, it's Paulo! What's he doing now, anyway?
  
• I'm meant to be an explorer, and sitting behind a computer all day is a waste of my God-given talents.
  
• I wanted to share something with my sister. By writing out the lyrics, she now has the song stuck in her head as well. Misery loves company!

Hey, I said they were improbable. Ca-noe, ca-noe, can you ca-noe...