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Is this some sort of tunnel?

“Is it…?”

Yes, I think it is sloping downwards.  Looks longer than you would have thought.

“Tell us a story, Daddy,” says Isobel as we walk.

Okay.  How about Why Rudolph bought Blitzen a Goat for Christmas?

“Why did he do that?”

I’ll tell you. Well, one year, Rudolph bought Blitzen two pairs of socks.

“Two?  Oh – front and back?”

Yes.  But, unfortunately, Blitzen didn’t buy Rudolph anything because he hadn’t expected a present.

“That’s awkward!  Why…?”

Ah, hang on.  Here’s a door.

“Just one?  No choice?”

No choice.  Let’s go through.