Kaboom! is a vitamin fortified, circus-themed breakfast cereal containing fruity-flavored corn cereal bits shaped like smiling clown faces and marshmallow bears, lions, elephants, and stars.
Quentin Tarantino's 2003 movie Kill Bill Vol. 1 included a scene in which character Vernita Green pulls a weapon out of a box of Kaboom! cereal in an attempt to eliminate The Bride.