summit
Explanation
The comic is a simple two-panel joke about misleading measurements. A man brags to a woman: "Climbing. Yeah, I'm into it. Last summit was 30 football fields in height." The woman is visibly impressed, responding "Wowwww."
The punchline appears in the caption below: "Conversation tip: football fields are zero centimeters tall."
The joke hinges on the common practice of using football fields as a unit of measurement for length (about 100 yards or 91 meters). The man exploits the fact that people instinctively associate "football fields" with a large measurement, but he specifies "in height" - and a football field is flat, so its height is essentially zero. Thirty times zero is still zero. The comic satirizes how people use impressive-sounding but meaningless metrics to inflate their accomplishments, and how listeners often fail to scrutinize the actual meaning behind comparative measurements. It is also a dig at the American habit of measuring things in football fields rather than standard units.