Differentiation between a optimist, a pessimist and myself.

For starters, we're not talking about maths here. Thats it.

The universal test: A glass with half the amount of water inside. Describe.
O:The glass is half filled with water.
P:The glass is half emptied of water.
Me: Depends on the situation. If the glass is initially empty, it is half full. If the glass is initially filled with water, it is half empty.

Test 2: In a race, the rabbit travels 100m while the tortoise travels 50m. Compare the speed(assume a=0)
O: The rabbit runs twice as fast as the tortoise.
P: The tortoise runs twice as slow as the rabbit.
Me: Depends on the allocation of the subject. If its the rabbit in comparison to the tortoise, then the rabbit is running twice as fast as the tortoise. If its the tortoise in comparison with the rabbit, then the tortoise will be running twice as slow as the rabbit(half can be used, but its more confusing to me).

Test 3: How they look forward when walking.
O: Face towards the front.
P: Face towards the ground.
Me: Both. I look straight ahead so that i won't hit my head on any person or any post, and look down so that i won't step onto any shit.

Test 4: One day out playing on a sunny beach. Suddenly there is a slight drizzle. The immediate response.
O: This drizzle kinda cools me down =)
P: The rain is going to build up. Must hurry indoorsor we'll catch a cold.
Me: Oh what the heck. Just play on.
Theres more...