Oh I'd be jumping on rocks behind the flowing blonde locks of legolas that sparkles under the shy light of the morning sun, next to me is the heavy steps of gimli's boots and rough breaths, and in front of us is aragorn high on his horse with a relieved smile on his face, telling us to keep our pace quick and steady because there, not far ahead, under the thin cool frog, upon the rocky mountain, lies our final destination.
If it were Game of Thrones, you could easily die within a week. But, except for that, most alternate realities kill off the jerks eventually (Jurassic Park's lawyer, the guy who threatened the captain in Firefly right in front of a running jet engine...bad move), but important side characters survive. If you are the comic relief, you're usually safe. If you are important enough for a main character to come to our reality to get you, you are above the level of the "cannon fodder" needed to advance the story (vampires need to kill some unimportant innocents, some of those office workers must have died when The Avengers were protecting NY against aliens), so you should be OK. Maybe I could help Sam and Dean kill a shape shifter, get hit on the head and have a delusional conversation with Bobby Singer or maybe a minor angel, then come out of the coma with information that helps Sam recover his soul. So, like a four episode short term guest.
Lol
To make this weirder: I am a 56 yo dad.