So, we have one of these Aquadraws for the kids, right? It's a 3x3 mat with pens you fill with water and then draw on. The water dries, there's no mess, and the kids get to draw for as long as they want. It's absolutely brilliant.
Well, I just glanced down to the floor to see what they were drawing.
Alex has discovered his tongue is wet, too.
He's now using his tongue to draw on the mat. :D