Hi, can I speak to Darren, please?
He's just on the phone. What's it regarding?
He wanted to talk to me about a Japanese TV documentary. I'm a memory man.
Oh, yes. Can you leave your number, and he'll call you back?
Yes, it's 0115... 8...
I've forgotten. Um... [frantically hunting for my latest phone bill]
Eventually I told her a number, hung up, found the phone bill, called back to tell her the right number, and hung up again in deep embarrassment. And he didn't call me back.