Beaches have good ambient noise for focusing on incantations.

[One day someone will tell Dipper he's a witch.]

[Anyway, Dipper balks at that answer.]

You heard me calling? I don't remember... [He has to think back, even if its extremely unpleasant, and as he does the sky grows just a little darker. He remembers the room, and he remembers screaming, but then-]

Did we ...do a weird mind-link thing again?