1. When you saw girls in those light blue pinafore(don't stare too much, people would mistake you as a paedophile now that you are old) and suddenly you felt "oh,how I miss wearing those cute pinafore."
2. When you tibe-tibe terpikir: oh, when was the last time aku lepak kat castle? Cam dah lame x syisya n minum air pineapple dalam botol tulisan arab tu
3. When you start calculating your money for future house purchase
4. When you and your friends start to talk more and more about future careers instead of about the hottest guy in campus
5. When you write this post. Dang.