I went swimming for the first time in over three years this morning. I found out that swimmers are just as anal as cyclists are. Apparently you must inform the other swimmers in your lane prior to beginning your laps that you will be swimming in their lane. Additionally, if there are only two people in your lane, you stay on the same side of the lane. If there are more than two people, you circle, which is how I swim if there are at least two people. If you don't follow these rules, they'll stop you in the middle of the pool just to let you know that you've broken the rules.
Also, don't pay cash to get in or the entire line will groan. Finally, a speedo is required or you are laughed at.
I'm glad that I now have two sports whose participants I don't like. I was getting bored only hating cyclists.
Just swam an easy 900 this morning. I'll probably be swimming twice a week until I start training seriously for a race again, at which point I'll drop swimming for the boring exercise that it is.