Jesus christ, I just found a secret that Notch didn't tell us about!
I was building my portal to the well known Nether when my dad called me down to dinner, after I ate, I came back up and must've accidentally switched blocks, and I set down 2 diamond blocks in the last 2 places of the portal. I noticed my mistake, but decided to light it anyways, considering I knew it would do no harm, and I would just end up removing them anyways. As soon as I lit it up a blue haze, similiar but distinct to the Nether portal block appeared. I don't want to go through it, gotta back up my saves...
Just thought'd I'd show you guys first before I did anything more. :D
