Do you need kind of incentives for making such a beautiful friendship like this?

Mankiw's book told us since we entered this college : Rational People tend to incentives
are we rational people?i dont know
but, i know for sure. we dont need any kind of incentives for still walk together as bestfriend.
Maybe this is our final year, we've already through all happy,sad, surprising,and bored moments together. No matter who we are for years from now, just remember the one label, PIGGIES, the big family of IE 2006.