Another gem from Private Eye

Here's a brilliancy by Ian Baker:

A puzzle solved

Last night I was sitting at my computer when I became aware of an occasional creaking noise coming from my right. I first of all thought it was outside but as it recurred it seemed closer.

It seemed to be becoming more frequent so I got up and walked over towards the window hoping to locate it. But it didn't recur.

This morning it was apparent again. Was the weight of my books too much and were the beams supporting the floor groaning before breaking? Again, investigating where the noise was coming from failed because I was never there when it happened.

Finally this afternoon I realised that the sound was simply my mouse cable rubbing against the edge of the table. Which is why I only heard it when I was at the computer!