Wait What?

Effects

Upon use, Isaac farts, knocking back enemies and their shots. It also sends out rock waves that deal 10 damage per tick to nearby enemies and break obstacles.

This item is identical to Butter Bean in appearance.
(Removed in Repentance) Butter Bean has a small chance to turn into this item upon pickup.
(Added in Repentance) Each run as a chance of replacing Butter Bean with Wait What? in item pools. Both items generally do not exist during the same run.
This item is useful for opening Secret Rooms, Super Secret Rooms, and Bedrooms. In Bedrooms, it can also open up the passage under the carpet.
- To break open a secret room, the wall must be hit with one of the rock waves, not the gas cloud, so Isaac needs to stand a few steps away from the wall.
The earthquake can open Bomb Chests.
(Removed in Repentance) The earthquake can be used to blow up the Donation Machine or activate/blow up a Restock Box.

(Added in Repentance) Book of Virtues: Spawns white-glowing wisps on the middle ring that don't shoot. The wisps invoke the effect of Wait What? when destroyed and do not persist between rooms.
Ghost Pepper: Shoots a flame behind Isaac upon each use of Wait What. While Car Battery does not duplicate Wait What's shockwave, the flame shot is duplicated regardless.