If there was a list of people (and robots) that should avoid rapping—and maybe there ought to be—C-3P0 would be sitting pretty far up towards the top. Fluent in six million forms of communication and not an ounce of flow.
Buzzfeed explains the clip's bewildering existence:
In 1986, to help promote the soon to be open Star Tours ride at Disneyland, ABC aired the TV special A Vacation In Space. The special gave viewers a look at some of the behind-the-scenes footage on the making of Star Tours, as well as the history of space travel and space-related films.
But somewhere—amid the references to the lack of gravity in space and the other references to lack of gravity in space—there's something inexplicably catchy in there. No one will blame you if you listen to just one more time. And one more time. And then just one more time after that. [Everything is Terrible via Laughing Squid via Buzzfeed]