The list further includes, without a valid reason:
• taking and killing a louse or similar pest when it is not causing harm;
• covering the nose or mouth;
• keeping something in the mouth that interferes with the prescribed recitation;
• making Sajdah on the wrapped coil of one's turban in the disliked case;
• making Sajdah directly on a picture;
• restricting Sajdah to the forehead alone while leaving the nose without an excuse.
If a pest is actually harmful, or dust or grass on the forehead is genuinely causing harm or distraction, the later “not disliked” section gives appropriate exceptions.