João Luís (thank you!) points this interesting video that appears to show some iridescence and general awesomeness.

The description on Youtube does not seem very credible, but the language spoken does seem to suggest it comes from Indonesia. We have already presented some clouds of wonder here in Forgetomori, mainly pileus clouds, but this looks like a different phenomenon.

It's not just a cloud. It's an amazing cloud. The fact it's "just" water droplets and probably crystals in suspension, illuminated in a certain way to produce such a beautiful effect is much more amazing than the idea that it's a (badly) disguised alien spaceship.

But that's just a matter of opinion. If you know exactly what type of cloud this is, do share your knowledge in the comments.