Information on the cameo
Rufus is a character from Bill & Ted's Excellent Adventure, as well as its sequel, Bill & Ted's Bogus Journey, and other spin-off media. He guides/mentors Bill and Ted during the start of their journey and appears again when they finish to tell them about the future their music creates. He was portrayed by the late comedian George Carlin.
Appearance in the rap battle
Rufus appeared from the phone booth time machine during Bill & Ted's second verse after Ted said "I don't know" in response to Bill asking, "What do we do?" He says, "Be excellent," and then opens his jacket while dancing as Bill and Ted rapped their next line. He disappeared in the next shot.
- Rufus is the fourth cameo to have two different people acting and speaking for them.