Has anyone seen my underpants?

My underpants are white and blue;

One day I dropped them in the loo.

I heard them gurgle down the pipe,

But couldn’t find them on my Skype.

How far, how far, will they travel?

I hope the stitches won’t unravel.

And if they’re in some spooky drain,

Will I ever see them again?

What if the sewer goes out to sea?

My underpants might reach Fiji!

Or has some big fish put them on?

I think my underpants have gone.