Oh yeah, a cool thing I did in Ascension to the Throne yesterday:

I found out a few days ago how to do out of bounds clips using enemy encounters, and I was curious about a portal in the final arena that you couldn't ever interact with because you're in cutscenes while you're there. Managed to get out of bounds and walk straight through lava on over there.

Turns out it doesn't function like other portals, but it's an ending warp.