No. 2

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No. 2 is a passive item added in the Binding of Isaac: Afterbirth expansion.

Effects[edit | edit source]

Continuously firing or charging tears for 3 seconds causes Isaac to drop a Butt Bomb. Only 1 Butt Bomb can be dropped per charging cycle, so you'll need to stop firing and then charge again to drop another Butt Bomb. Taking Damage will interrupt the cycle.
Butt Bombs explode for 50 damage like normal bombs, but also deal 10 damage to all enemies in the room and daze them for a short period of time.
Essentially grants unlimited bombs, as you can just reset the charge time over and over to bomb tinted rocks and to get into Secret and Super Secret Rooms.

Bobby-BombGives Isaac 5 Bombs, and causes all dropped bombs to home towards the closest enemy. - Butt Bombs will home in on enemies.
Glitter BombsGives Isaac 5 bombs, and makes Isaac's bombs have a chance to drop random pickups or charm enemies when they explode. - Butt Bombs can drop pickups.
MarkedIsaac will now fire tears automatically directed at a red target on the ground which is controlled by the player. This allows for a full 360 degree tear firing radius. Can be overridden by other tear modifiers such as Mom's Knife or Brimstone. - Holding the fire key to move the crosshairs for 3 seconds drops a butt bomb.
Sad Bombs+5 Bombs. Upon exploding, bombs shoot 8 tears off in every direction, similar to Tammy's Head. The tears are affected by any tear modifiers Isaac has on his own tears. - Butt Bombs will also shoot 10 tears off in every direction.
PyromaniacIsaac heals 1 heart instead of taking damage from an explosive source. Adds 5 bombs. - Butt Bombs regenerate health.
Scatter BombsAdds 5 bombs. Isaac's bombs explode into 2-4 tiny bombs. - 2-4 smaller Butt Bombs will spawn after the first detonates.

Increases difficulty of poop-themed bosses such as Dingle, as the Butt Bomb restore the boss' hp when they explode.

PC 1A8Z 43DC (Treasure room adjacent to spawn)