I’m a Bird
One of the single best descriptions of human emotion I have ever read, with evocative, perfect illustrations rendered simply, but not simplistically, in Microsoft Paint. This is pure empathy for the experience of frustration — with the honest truth that the person on which said anger / frustration is vented is rarely if ever the person toward whom it is directed. If it even is a person.
Her books Hyperbole and a Half and Solutions and Other Problems are both on my shelves and worth owning.