I work in a small office with most of the time there being eight or nine of us. We have two restrooms, each being "one-holers." One is unofficially designated for Men and the other for Women, but in a pinch we can use whichever one is vacant if the normal one is occupado.
On occasion, for some unknown Cosmic Reason, me and one of the other guys will somehow get on the same Pee Schedule. Whenever I have to go, he's either already in there or stands up to go about the time my bladder says "Now." Other times I will get there first and will be locking the door about the time nature gives him a call. We work at opposite ends of the office, but there's a window where I can see him in his corner, but even planning didn't overcome the woe that was us. The last time this happened was a few weeks back.
We have other differences (he drinks coffee, I don't) that would make you think it's a never-happen or once-in-a-lifetime quirk in the Galactic Pee Schedule. But it's happened more than once and I bet it will happen again. It got so annoying last time that I even had to use the typically Women's restroom. Ack! I even tried to drink less water, then more water, to throw a monkey in this wrenching delimma. If life had handed me lemonade, I would have downed the whole pitcher in an effort to get back into my own time zone, Solo Pissing Time (SPT).
While it's easy to laugh off now, espeically because I'm at home living in WhenverIWannaPee Land, it's no laughing matter when it's going on. What if it happens again, but some women are also on the same Pee Schedule? I'll be relegated to hoping real hard that my bladder won't explode, I'll be sprinting to the loo or I'll be moistening the Dumpster in the alley.
I've had this phenomenon occur at previous jobs, but most of the offices had not only multiple urinals/toilets in the restroom, most had multiple restrooms. If it happened that my sked matched someone else's, we could avoid embarrassing chats at the urinals by using another restroom.
The only thing that's worse than all this? Remembering the Synchronized Poo Relays of April 2004, during which it really paid to be the fastest one to the can. Trust me on that one.

I work on a floor with restrooms in a common area for the entire floor and I'm totally on the same pee schedule with the travel agent down the hall. We always look down in shame at the floor when we're passing each other in the hall. Or maybe since I pee all the time EVERYONE is on my pee schedule!
Perhaps he is mildly interested in you in other ways and uses the pee break as an excuse to run into you....
Here in our building we have a total of 3 urinals abd 3 sit downs per floor. Thats 12 urinals and 12 sit downs total and I can gurantee you that from 1:00 until around 2:30 you cannot find a free sit down anywhere. Nothing worse than sitting on a warm toilet seat.
so tbone, why don't you clock when you go and start going thirty minutes before nature calls based on your clock. more than likely, you have to go thirty minutes earlier but just haven't realized it.
Try working in a trailer next to the building with the single bathroom after hours when they lock up said building. Nearest building with open facilities is about 1/2 mile away. I'm in that situation once every 20 days (duty rotation) and luckily the worse has yet to raise its ugly head. Knock on wood!
Truly a fly's eye's glimpse on modern society.
Hmm..that is interesting. Perhaps it's akin to that phenomenon where women who live together end up all getting their periods at the same time?
I say keep a potted plant in your office for emergencies...
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