I rarely get to confirm whether I'm right or wrong, but everyone sounds slightly different.
I only do it for my own amusement. I don't inflict my "guessing" upon my colleagues, no one knows. For me, it's a lesson in working out "how may I maximise my anonymity".
I generally respect the "polite silence" rule upon entering the ceramic room - someone else must break the rule before I will.
Don't read on if it literally will cause more anxiety.
I was in a different 'cubicle' and noticed that the shadows meant I could see that the person next to me was using their phone, so now that's an additional consideration for minimising my identifiable footprint on the throne.
“Mark? Is that you?”
“…Tim?”
“Yeah, any update on the report?”
“…”
“OK, no problem buddy”