You have a strange feeling for a moment then it passes

You have a strange feeling for a moment, then it passes.

This message is produced by reading any of five scrolls or drinking either of two potions:

• scroll
  • scroll of destroy armor - if you are not wearing any armor.
  • scroll of enchant armor - if you are not wearing any armor.
  • scroll of enchant weapon - if you are not wielding a weapon.
  • scroll of food detection - if there is no food on the level.
  • scroll of gold detection - if there is no gold on the level.
• potion
  • potion of object detection - if there are no objects on the level.
  • potion of monster detection - if there are no monsters on the level.