This woman decides to buy a self-assembly cupboard.
Back home she reads the instructions carefully and assembles the cupboard in the bedroom. It looks really neat.
Then, a train passes and the whole cupboard collapses.
Not daunted by this she re-reads the instructions and reassembles the cupboard. Then, another train passes and the whole cupboard collapses again.
Thinking that she must have done “something” wrong she re-re-reads the instructions and re-re-assembles the cupboard. Then, a train passes and the whole cupboard collapses yet again.
Now, she’s finally fed up with this and calls the customer service department. She is told that this is quite impossible and that they’ll send along a technician to have a look.
The technician arrives and re-assembles the cupboard. Then, a train passes and the cupboard collapses. Completely baffled by this unexpected event, the technician decides to reassemble the cupboard and sit inside it to see whether he can find out what causes the cupboard to collapse.
At this point, the woman’s husband comes home, sees the cupboard and says: “That’s a nice looking cupboard”, and opens it.
Says the technician: “You won’t believe me, but I’m standing here waiting for a train”.