The Glass Is Never Half Empty

Often in order to determine whether you are an optimist or a pessimist, someone may take a glass and fill it with water till it is half full and ask you if you see the glass as half full or half empty.

If you see the glass as half full you are said to be an optimist

If you see the glass as half empty you are said to be a pessimist

However, as a pessimist, I feel that the glass is always half full and cannot be half empty. My logic for this can be explained through the following:

Consider a glass that is full of water

Now halve the amount of water in the glass. The Glass is now half full.

Consider a glass that is empty

If you try and halve the amount of water in the glass it is still empty. Therefore, a half empty glass is the same as an empty glass. Hence, the glass is always half full, and never half empty irrespective of whether or not you are considered to be a pessimist or an optimist.