If I could find the cords to hook my camera to my computer, we'd play the What Is It? Game.
Suffice it to say, you don't want to know what is in the trap beneath your bathroom sink. There may be hair, there may be sand, there may be rocks and seashells, there is probably muck and mold. But did you know there could also be a sucker stick? Did you know the pipe could be so full you don't know how water can get through? Did you know it could be so full as to make the pipe rigid enough to snap in two?
Betcha didn't know that.
Or maybe you did....Dad.