Reddit user superemmjay tracked his weight for 20 months and plotted the measurements. The annotation makes interesting what would otherwise be just some graph of someone’s weight over time.
See also: eight years of dating, the fitbit during sex, the marriage proposal heartbeat, and the quantified breakup.
There’s “letting the data speak” and then there’s this, where people who are closely familiar with their own data explain what’s there with some simple notes. Those little pointers make a big difference for outsiders who don’t know the context of where the numbers come from.