I am visiting a dear friend this week. The morning after I got here, I was adjusting the shower water, and noticing that the knob is one of the sort that one turns about a turn and a half to get to "hot", and then turns it back some amount that's really kind of dependent on the vagaries of the particular valve to get to the right temperature. So, I made a guess as to what would be right, and turned it there.
Then I noticed that, just a little bit off from where I'd turned it, there was a small blue pointy sticker. And so I thought, "Aha, I know what this means," and turned it to that point, and indeed a moment later the water was at the perfect temperature.
This makes me very happy.
Crossposted from Dreamwidth (original here), with comments. Comment here or there; comments here will eventually be duplicated to there.