All By Myself by Green Day is a satirical and humorous song about loneliness and isolation. The lyrics depict the comical side of being alone, where the protagonist humorously describes his mundane and absurd actions when he's by himself. Key themes include solitude, the absurdity of daily life when one is alone, and a tongue-in-cheek look at personal habits. Particularly poignant moments include the exaggerated actions the protagonist takes which highlight the blend of humor and melancholy associated with being all by oneself.