Yes. I had this happen once, but it ended up on my third eye and now I can clearly see the future. :)
No. Your eye lids are attached to the white of your eye by a membrane called the conjunctiva. Even if a lens slides back the edge will still be reachable.
So, what do you do if the lens slides out of place?
You can see that he's able to move the contact lens around using his finger, his eye, and his eyelid. In most cases, you can look toward the lens, and it will slide onto the pupil. If this doesn't work, look away from the lens. This should pull it past the lid enough that you can reach it, letting you slide it onto your pupil normally. When removing, note that you should be moving the lens downward: the conjunctiva is much closer to the edge of the lower lid, so there's nowhere for the lens to hide.
Posted 4724 day ago