Every single SciFi show uses a shimmering effect when that happens, and I never saw that effect. So, it either happened when I was sleeping or otherwise wasn't looking, or it didn't happen. Or maybe it happened the night I took all of those mushrooms. Never can tell if I'm seeing something or just seeing something.
I'm pretty sure going through a micro black hole involves everything being spaghettified and... waaait a minute, now that you mention it I've been eating a LOT of spaghetti these last few months.
Would we know if we were sucked into an alternate timeline via that kind of science? Would it matter to us? Could we change it?
I'm sure there's a YA novel in there somewhere.