Scammer: Hello, this is from BT.
Me: Hello (BT isn't my Internet Service Provider, by the way)
Scammer: There have been Internet faults in your area. Have you noticed anything wrong with your connection lately?
Me: No, I haven't. It has been working fine.
Scammer: Have you noticed any problems between the hours of 12AM and 4AM? (He's obviously picking a time where he expects I wouldn't be using my the Internet connection)
Me: (Get ready for a whopper. Or two) Yes, I am up throughout the night as I am a software programmer and it's the only free time I get. I haven't noticed anything.