I recently had my piano tuned.
Now this would not normally be a topic for conversation except it was the first time the piano has been tuned in, oh, about umpty-ump years or thereabouts. Happily, it was still in a tunable condition, and the expert piano tuner was able to bring it to within about a half tone of concert pitch. Since I don't plan on giving my rendition of the Liszt E-Flat Piano Concerto with the Philadelphia Orchestra anytime soon, that shouldn't be a problem.
Well you may wonder why it took so long for me to have it tuned. The answer is, I'm afraid, rather mundane. It was mostly a negative feedback loop; every time I sat down to practice, I gave up because the piano was out of tune, every time I thought I should get it tuned, I didn't bother because I never practiced.
Anyway, once it was back in playable condition, I promised myself to practice, at least a little bit, every day. Since exercises can be very boring, I decided to tackle a relatively simple Bach Gavotte (the first one from the third English Suite, if you must know).
And right away I ran into a fingering problem. While the gavotte in question is unlikely to prove tricky for a good pianist, I needed to figure out which fingers to use for which notes. That was not a problem, but remembering the fingering between practice sessions was.
Thus, the need for a pencil. As it turns out, I can't recall the last time I used a pencil, but I was in luck, as there was a single mechanical pencil in one of my drawers. That did the trick.
Just to be sure, however, I made a quick run to the nearest office supply store and bought a few more, plus some erasers. I now have enough mechanical pencils with lead refills to last the rest of my life--assuming the only thing I use them for is to note my fingering in piano scores.