quantum-4
Explanation
This comic plays on the popular misconception and overuse of the word "quantum" in everyday conversation. A woman at what appears to be a bar is explaining to a man that the combination of carbon and sugar molecules in their beverages actually involves quantum mechanics, since at the subatomic level, particles and their interactions are governed by quantum physics.
The man initially reacts with surprise ("What?!"), but the woman patiently explains that because everything is made of particles, and particles behave according to quantum mechanics, technically everything is quantum — including the drink in his hand.
She then clarifies the point further: the beverage is made of particles that interact with the particles of your body, and quantum mechanics governs all of these interactions. This is all technically, boringly true.
In the final panel, the man asks "What else do people think we're talking about?" and the woman responds "Now that I think about it, I have no idea." The joke is that two physicists having a perfectly mundane, technically accurate conversation about quantum mechanics at a bar might appear to outsiders as if they are discussing something profound, mystical, or suggestive — when they are really just stating basic facts about particle physics. The humor comes from the gap between how "quantum" sounds to laypeople (mysterious, exotic) versus what it actually means to physicists (the ordinary fundamental physics underlying everything).