Mud is a substance for which Ulillillia has a curious affinity. Mud makes frequent appearances in his dreams and in his mind game, and he has shown a fondness for mud in his waking life as well.

Ulillillia has recorded over 50 dreams involving mud or quicksand in his dream journal. The dreams were apparently triggered by a TV show he watched in 1998 or 1999 featuring "a bunch of humans standing in waist-deep mud handing sandbags between each other". The first mud dream occurred in 1999 or 2000 and remains his favorite.

Ulillillia also enjoys taking mud baths in real life.

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