Oh, I hope this works...
Chill, Pinkie. It's on.
Oh thank goodness! You all can hear me, right? Phew... I thought the portal was broken during that trip.
I mean, I'm somewhere that my friends don't exist... And I hate it... But at least I have Mena and you guys, right?
Oh, I should explain. Well, you see, Twilight asked me to help her test out a spell, and of course I said yes!
I didn't know the spell was a dimension hop spell, though... And now I'm in a weird place that has white walls and something that says... Um... S... C... P...? I think that's it.
I heard a lot of steps, but I don't think they were ponies... I have no idea if it's safe to go out or not.
So I'm staying in this broom closet for now, it doesn't look like it's been used for a long time. I really hope nothing tries to eat me or hurt me...
What should I do? I really, really need your help! Do any of you know anything about where I am? Oh, please tell me...
It's alright, Pinkie... Don't worry... I'm here.
Guys, if you can give us any information, that'd be great. Thanks... I've gotta comfort Pinkie, so I need to shut down the portal.
I don't know how much power is left in it.
Well, crap. Girls, you're in one of the SCP Foundation's sites.
A quick overview: SCP is an acronym that also serves as their motto and mission statement; Secure, Contain, Protect. Since you're outside the 'norm' for the world you're now on, they're going to try and capture (Secure) and cage (Contain) you. However, this is where the P comes in. In the world you're now in, people tend to lash out at things they consider unusual. The third part of their mission is to keep the various SCPs (sometimes called Skips) safe from those that do you harm (Protect). Really, the Foundation sites are among the safest places you could have ended up at.
That being said, they put more focus on protecting humanity from SCPs than vice versa. If you're determined to be a threat to humanity, they'll focus more on the C than the P, if you get my meaning. Cooperation is easily your best bet when you get found. And yes, I mean when, not if. The Foundation has all kinds of defenses and systems in place on their sites. Mostly in the event that one of the SCPs escapes containment, but also to keep them safe from aggressors.
On the subject of SCPs... well, they range all over the place, really. SCP-999 is a sort of blob that enjoys tickling people and makes them happy with just a touch. SCP-682 is a homicidal reptile that quickly adapts to any attempts made to kill it, up to and including straight-up reality warping like Discord can do. SCP-294 is a coffee machine that can produce any liquid. SCP-173 is an animate killer statue even 682 is afraid of (If you see it, don't blink). SCP-343 is the local equivalent of God. SCP-096 will kill anything that views its face. SCP-500 can cure any sort of disease.
As for advice, I don't have much to give, sadly. The more you cooperate with them, the easier things will be. If alarms start going off, stay in there and stay quiet.
Hoping for the best.
Coverart sauce: https://www.deviantart.com/joyfulinsanity/art/Nothing-Else-To-Do-424874555 (SFW and very adorable)
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Thanks for letting me know.