We work on the top floor of a 16 story building. There are about 70 men working on my floor, but there is a single men's room, with 1 western-style toilet (with washlet!) and 1 eastern-style squatter.
About two hours after lunch, everyone has the same urge, and it becomes an increasingly uncomfortable dash to get to an open head. I can't use those damned squatters. When the 16F toilet is occupied, I have to use the stairs and go to 15F. If the 15F toilet is occupied, I usually call the elevator and take it to 3F, because it's largely unoccupied by other businesses, and the toilets are empty.
But sometimes it's taken, too.
In those cases, it's back to the stairs, and a dash for the 2F single stall, or the one on the first floor. By this point, it's a race against the clock, and in my head the theme for Mission Impossible is playing really, really loudly.