It’s a reference to an infamous 4 panel comic strip called “loss”. It’s one of them ancient memes from 2008. If I remember correctly, the story of the comic is that the dude rushes in to the hospital to find his pregnant wife had just lost their baby or something. If you dumb it down enough and reduce the characters to lines, you end up with
I II
II I–
The water takes a couple minutes to warm up after it’s turned off. If I were to turn off the water for each task, showering would take even longer as I wait for the water temperature to normalize itself again