Throwing enderpearl into Nether Portal teleports user to coordinates of the Nether Portal in the other dimension in the dimension they're currently in.

Sorry for the title gore.
The events I would assume that would happen when I do this is that it will not teleport me until I go through the nether portal.
This video details the events in both the Overworld and Nether.
https://www.youtube.com/watch?v=Y49Hd2Iv9KQ