xkcd by Randall Munroe is one of my favorite web comics. New strips are published every Monday, Wednesday, and Friday. It’s (mostly) humor with stick figures, and common topics include science, math, computing, and social interactions. Pointers

This is an example of an early strip. The joke refers to pointers as found in low-level programming languages such as C.

Designated Drivers

This is a more modern strip, and one of my all-time favorites. The punchline requires prior familiarity with the wolf, sheep, and cabbage problem.