I stumbled across this while looking through old PSP physical releases and ended up going down a bit of a rabbit hole. In 2005, Sony released a version of the movie Stealth on UMD that also had a playable, exclusive version of WipEout Pure on the same disc, complete with a Stealth-themed track and a craft based on the film's fighter jet.
I ended up writing a little piece about what was on the UMD, why Sony was experimenting with movie/game hybrids at the time, and what survives of this very strange release today. It is a super light little read, but when it comes to PSP's these days, there's woefully few of those!
Hopefully some in here find it amusing :)