The pool where I lap-swim has five lanes. The most convenient lane, for those of us with bad backs and bad knees, is the one next to the steps leading down into the pool. Yesterday that lane was free, so I came down those steps and started splashing cold water on my head, preparing to take the plunge.
Just then a big old fellow descended the steps and swam away, in MY LANE! I was furious with him. It's easy for two people to share a lane, but he didn't ask, and anyway there were two empty lanes.
We're all club members here, so there's no point making fuss. I shifted to the next lane and started to swim.
When you're swimming many laps, you need something to think about, to make time fly. Boredom is the enemy of any repetitive exercise. Well I had something to think about this time! As I swam my first laps, I kept glancing at my interloper, and mentally grumbling. But an unexpected thing happened: he swam to the far end; he swam back to the stairs; he walked out of the pool and departed, after less than three minutes in the water.
I swiched lanes, even though I had to "break stride" to do it. I wanted my lane back!