The other cubicle

TRAVELLING along the motor way and needing to use the toilet, I stopped at a service area and headed to the toilet.
“Hi, how are you?”
I’m not the type to start a conversation in the toilet and I don’t know what got into me, but I answered, somewhat embarrassed,
“Doin’ just fine!” And the other person says:
“So what are you up to?”
What kind of question is that? At that point, I’m thinking this is too bizarre so I say: “Uhhh, I’m like you, just travelling!”
At this point I am just trying to get out as fast as I can when I hear another question.
“Can I come over?”
Ok, this question is just too weird for me but I figured I could just be polite and end the conversation. So I say
“No…I’m a little busy right now!!!”
Then I hear the person say nervously… “Listen, I’ll have to call you back. There’s an idiot in the other cubicle who keeps answering all my questions.”