I was in this situation once. It’s not fun.

I had to use this public restroom and I was barely sitting down when I heard a voice from the other cubicle saying: "Hi, how are you?"
Now, I'm not the type to start a conversation in the men's restroom
but I don't know what got into me, so I answered, somewhat embarrassed,
"Doin' just fine!"
And the other guy 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. I tell him, "No........I'm a little busy right now!!!"
Then I hear the guy say nervously..."Listen, I'll have to call you back. There's an idiot in the other cubicle who keeps answering all my questions!!!"

Do you have any similar stories to share ;-) Please do .....