Known: Evergreen mills in a fenced area; Capital building, west entrance; Galaxy News Radio in front of the entrance; Takoma Industrial
There is also one that is brought about when grabbing a twitchy teddy bear at the end of the evergreen mills track in a Super Mutant camp. If you follow the track out of evergreen mills there are a few train cars found outside of the cliffs. Be careful of Super Mutants (possible Brutes and Masters depending on your level). They have shopping carts set up in this area as slave cages. One contains a teddy bear which will wave or twitch his arm wildly when you open the cage. If you grab him the Behemoth will come and attack you (even if you have a stealth boy active).