punchline-2
Explanation
This comic is a concise visual pun built on the cliche "I will die on this hill," meaning to defend a position stubbornly regardless of consequences.
In the first panel, a man angrily declares: "People who use cliches as punchlines should be put to death in conspicuous locations!" This is an absurd, over-the-top opinion about comedy -- that using a cliche as a punchline is so offensive it merits capital punishment.
The second panel shows the same man standing on top of a literal green hill, shouting "I will die on this hill!" He is now using a cliche as his own punchline, which by his own stated principle means he should be executed in a conspicuous location -- and he is indeed standing in a very conspicuous location (the top of a hill), ready to receive his self-imposed sentence.
The joke works on multiple levels: the man's statement is itself a cliche used as a punchline, making him guilty of his own crime; the phrase "die on this hill" is both figurative (he's committed to his position) and literal (he's on a hill where he said offenders should be killed); and the "conspicuous location" requirement is fulfilled by the hilltop. It's a self-referential, self-defeating joke about self-referential, self-defeating humor.