Hvorfor ikke?

Someone had written this in the snow outside my house:



I can think of many answers:

Because the snow melts.
Because someone will step on it.
Because more snow will cover it.
Because the snow plough will plough it away.

But the one i like most is:

Indeed! Why not?

I imagine how it must have felt, to dip a finger in the snow and carve the words out. Who cares what becomes of them?