When Maglor tries to leave his bedroom that day, there will be an endless sea of half-filled cups and pots and bowls and whatever else might be able to hold water covering the floor, and endless sea of them. It's not really hard to figure out who did that, especially not when there are two heads poking out from behind a corner, waiting for the occupant of the room to come out.

They'll pull out of sight the moment that Maglor notices them.