Clog

Clog is a boss introduced in The Binding of Isaac: Repentance and can appear in.

Behavior
Clog remains stationary generally in the center of the room but can rarely be encountered at the center top of the room. It performs the following attacks:
 * Spits out a Drip below it and can occasionally repeat this attack multiple times with a maximum of 4 Drips alive at once.
 * Creates three lines of farts that spread across the room, knocking away Isaac and Drips. Each fart has a chance to spawn a Poop.
 * 1-2 Corny Poops are spawned in this attack.
 * If there are 2 or more Drips alive, Clog spins and causes the water in the room to circulate around him, catching Isaac and any spawned Drips in its current.
 * Shoots out 4 spiraling lines of projectiles.
 * Consists of either slow projectiles with small gaps in between or fast projectiles with bigger gaps in between.
 * Upon Clog's death all remaining Drips are "flushed" away identical to the effect of using on them.

Trivia

 * Clog appears to be a boss version of Splurt.
 * Upon death, Clog will play a flush animation where he disappears into the floor.
 * He shares the same "voice" with Brownie, albeit pitched down.