thor
Explanation
The Joke
A woman confronts a man in bed during a thunderstorm, saying she is starting to think he is not actually the God of Thunder. He asks "What?" and she points out that he always covers his ears and hides under a blanket when there is a thunderclap. He protests that he does not want his "brain shaken by a lightning mortal" -- a nonsensical excuse that sounds vaguely mythological but makes no sense.
In the final panels, the woman says she is willing to play along but asks him to just admit he is not a god and that this is "a weird sex thing." He remains silent while thunder booms outside, and she seems resigned to the situation. His refusal to break character, combined with the obvious cowardice, confirms that this is indeed just a strange roleplay scenario that has gone on far too long.
The Humor
The comic derives its humor from the contrast between the grandiose claim of being Thor, the Norse God of Thunder, and the decidedly un-godlike behavior of cowering under blankets during a storm. The woman's exasperated, practical assessment -- that this is clearly "a weird sex thing" -- punctures any remaining pretense. The joke also plays on relationship dynamics: the man has apparently been maintaining this Thor persona for long enough that his partner has reached a breaking point, suggesting this has been an ongoing commitment to a ridiculous bit. His stubborn refusal to admit the truth even when directly confronted makes it funnier.
References
- Thor, the Norse god of thunder from Old Norse mythology, also widely known from Marvel Comics and the MCU film series.