I think there are two kinds of people and things in the world: those that clump and those that do not.
For example - last week I was at Whole Foods. They usually have a fair number of samples scattered throughout the store. What I had never noticed is how close together they all are. You don't even have time to finish trying one thing before you're beset with another. I understand that there are good reasons for why they place their samples where they do (something about having them near the product they are actually trying to sell), but it's not convenient for us grazers.
Or today, when I was waiting for the bus. On my way to the bus stop I saw two buses go by (and I was too far away to catch them). Another bus didn't come for 15 minutes, and when it did, there was another bus immediately behind us. There are six bus lines that run down the street -and if they were to each go down the street every five minutes, no one would wait for a bus more than a few minutes. This way, they all seem to be on the same annoying schedule.