Personal response

If there is humor, it is very dark humor. The subtle suggestion that turning into a bug is somehow emancipating from his old life as a traveling salesman is ironically funny. The charwoman's expression when she first sees Gregor is a little funny as well,

When the true state of affairs now dawned on the charwoman, her eyes bulged with amazement and she whistled to herself. But instead of dawdling there, she yanked the bedroom door open andhollered into the darkness: "Go and look, it's croaked; it's lying there, absolutely croaked!"