You are taking a walk.
The weather is perfect. The sky is cloudy, but it isn't raining, and a cool breeze is blowing. Its soothing you. You are content. Relaxed. You are walking down the empty road,  thinking of your lover/crush/ex/bestie/anyone close to you; wishing to talk to him/her, imagining yourself in a hilarious convo with him/her, holding his/her hand in yours as you walk. You couldn't be happier (or gloomier).
On the way you happen to pass a river. Being in the mood that you are, you decide to loiter near it. The view is great. Gentle tides pushing away the present.
You start walking playfully on the concrete barrier. Suddenly you trip over a rock; reaching out your hand for support, you find nothing. A sharp chill runs through your heart.
You scream out loud,though somewhere amongst the  quick thoughts in your mind you know you are going to plunge into the water.
Before you know it the cold water touches you. Splashes and drops surround you. You beat frantically your restless arms, but only cold fluid flowing. Helpless... You reapeat your ****** movements over and over again. Legs trying to run away to safety; but there's no ground. No support. Your head goes under water.. Eyes open ; you breathe in the cool liquid. You try to cough out the water, but end up taking in more and more water.
Your body starts moving down towards the bottom. You are tired. You try. But it's not enough to get out. Exhausted.. and starting to feel numb.. and sleepy and tired and all those feelings creeping in. You see leaves floating.. Feel the fish slide against your skin.. But you can't respond. You lose consciousness in between . You cease.

All your dreams, all your thoughts, all the things that made you you, its no more. Mere chemical reactions in the brain. Your mind doesn't exist to even acknowledge that you existed. Or that you died. Not a slight trace of you in that motionless body...