I just wanted a crap but....

The other day I needed to pay a visit to the public toilet, so I found a public toilet that had two cubicles.
One of the doors was locked. So I went into the other one, closed the door, dropped my trousers and sat down.
A voice came from the cubicle next to me: "Hello mate, how are you doing?"
Although I thought that it was a bit strange, I didn't want to be rude, so I replied, "Not too bad, thanks."
After a short pause, I heard the voice again. "So, what are you up to?"
Again I answered, somewhat reluctantly, "Just having a quick shit... How about yourself?"
The next thing I heard him say was, "Sorry, mate, I'll have to call you back. I've got some twat in the cubicle next to me answering everything I say."