If you mean 4chan, whatever.
If you mean here, age req. 13.
This is how you count to 15.
1... 2... 3... 4... 5... 6... 7... 8... 9... 10... 11... 12... 13... 14... 15... And thats it!
I just counted to fifteen! Now, the question is, which came first, thirteen or fifteen?
EDIT: brb dinner.