Public Toilet - WhatsApp Joke

I was in a public toilet and had just sat down, when I heard a voice from the next cubicle, he said “Hi!, how are you?”
Embarrassed, I said, “I’m doing fine”.
The voice said “So what are you up to?”.
I said, “Just doing the same as you, sitting here!”.
From next door, “Can I come over?”. Annoyed, I said, "rather busy right now”.
The voice said, “Listen, I will have to call you back, there’s an idiot next door answering all my questions"