Falling Leaves

We saw a rather peculiar sign on our campus today:


How on earth can falling leaves endanger people passing by? Can innocent leaves be a lethal threat to humans?

Turning our eyes towards the sky, we realised why the sign has its justification:


Here you see Kamil, vividly illustrating the harmful potential of falling leaves.

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We still owe you the solution to our picture-riddle from January, 22nd 2008.
The picture shows rolls of rice-seed mats, which are used to replant rice fields. These rolls are loaded on a special rice-field tractor, which cuts the rolls into small pieces and plant the seedlings one by one into the flooded field.