Thoughts
Explanation
The Joke
A group of people are chatting, and one asks another, "What is really on your mind all day?" — implying that what someone thinks about constantly reveals something deep about them. One person admits they spend their time thinking about quartz. During the conversation, it's mentioned that it took a certain number of hours to process approximately 1000 grams of a geological substance. When asked "Is quartz on your mind all day?" the person replies, "Normally, I go by Teng."
The Humor
The comic plays with the double meaning of having something "on your mind." The setup leads the reader to expect a revelation about someone's inner emotional life or secret obsession. Instead, the punchline is a name-based misunderstanding — the person's name sounds like (or is) a geological/mineral term, creating confusion between "thinking about quartz" and the person named Quartz being "on your mind."
The joke subverts expectations by taking what seems like a deep psychological conversation and collapsing it into a simple case of mistaken identity or wordplay.
Broader Context
SMBC often sets up seemingly profound conversations only to deflate them with wordplay or literal interpretations. This comic is lighter than many SMBC strips, relying on a pun rather than a philosophical or scientific punchline.