Seizure.

Seizure is scientifically known as abnormal firing of neurons in the brain, disturbing it in a way that affects one's consciousness, sensations, movements or even behaviors. So notice that if it occurs to a part of your brain called hippocampus, you will stand a high chance of being overwhelmed with unusual emotions, which are most likely to be negative (e.g. fear and depression). What I'm trying to say simply is

'Blame this freaking Seizure when you suddenly feel down or scared for no reason'

You don't have to care whether it's actually due to this dude or something else. Just blame him. He would be more than happy to take it. And if you wish to get rid of Seizure? Well, assuming you're a normal person with a healthy brain, I would suggest you bang your head against the wall 10 times.

...

Lol, just kidding, don't do that or you'll really get to see Seizure more frequently. Well, if you're at home, having a personal computer and prefering to be alone, here are some suggestions:

- Do stupid nonsense things (I'll show you one example later on)
- Read your chat log with a nice person and find yourself unconsciously smiling
- Play games (it works every single time)
- Eat more chocolate or shit (uh oh...) I mean sweet
- Sleep

AND when practicing any of the above, don't forget to bear in mind Seizure is behind your weird feelings and will be kicked out of your brain in no time (together with the return of Happiness). Notice that it is not applicable when the cause of your bad mood is fully known. Good luck getting rid of negative emotions and stay happy 60% of the time. :)

Okay, as promised, here is some silly thing I did just now.

Ready to see?

Here you are...

Stylish right? RIGHT? Haha, needless to say, I'm too cool with this hairstyle. :D

Lol! You actually believed it was real?

Cheers.