I HAVE NIALL HORAN HOSTAGE! 
Sorry. This ^ isn't true, just needed to get your attention.
NOW LISTEN UP.
There is a very serious fever going round, and it causes concussion, dizziness, pounding in the heart. And maybe death.
This fever is called "ODF"
If  you are aware of what did is, and you think you have this. Then straight away consult a near doctor. 
You may tweet alot.
The ODF stands for "One Direction Fever"
This means you  have a weird obsession with the One Direction Band..now...you realised you have it.
Let me just tell you.
I have  it too and I want to share it with you *creepy  smile*