That mysterious Radiohead Optimistic Quake 3 promo clip that there’s strangely only a limited record of online https://www.reddit.com/r/radiohead/comments/2fpc4a/phantom_kid_a_promotional_video/
Likewise the Chuck D project Fine Arts Militia did a video in Quake 2 for their song Rebel vs Thug that also seems to have vanished from the internet.
Edit:
Here’s some proof for the latter beyond my own memory: Full Article