Winter

Let us love winter, for it is the spring of genius.

~ Pietro Aretino

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You have to watch your step when it's icy out.  You could slip and fall.  You could break something like a hip or your leg or your collarbone.  Or you could crack the ice and fall through into the freezing waters below.

Also, don't walk on ice that is over water.

Also, if it's so cold that the breeze is frozen - don't fall on that either. If you do, you might break wind.