" A little boy was tugging on his pant leg.
'Teacher, I have to pee.'
Avila woke from his skating dreams and looked around, pointed to some trees by the shore that grew out over the water; the bare network of branches fell like a shielding curtain toward the ice.
'You can pee there.'
The boy squinted at the trees.
'On the ice?'
'Yes? What is wrong with that? Makes new ice. Yellow. "

― John Ajvide Lindqvist , Let the Right One In