Sixth

Suddenly, there is a noise in the office. We half-heartedly look for the source and decide maybe it's the ducts, or something. Something up in that area. Then a female colleague says "it's so NOISY". Which is true, but so clearly true as to not really warrant the saying of. But then she says it again, and again. And at five-minute intervals for the rest of the day. So there are now two annoying noises in the office.