Anthony Daniels, the voice (and body!) of C-3PO, is a talented guy. He does the C-3PO "bumbling aristocrat" thing very, very well. What he does not do well is rhyme over beats.
This long-lost commercial is from 1986, and is from a TV special recorded to promote the then-new Star Tours ride at Disneyland.
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It...just...It's so bad it's good it's bad again then bottoms out at excruciating.
ONLY C-3PO CAN JUDGE ME [Everything is Terrible, via Laughing Squid]