This is gonna be "too much HoI2" but I'll go anyway:
617. When your history teacher says that France was conquered in 6 weeks, you start laughing hysterically and say "SIX? And you call that fast warfare!?"
618. When helping that nice girl studying history, you eventually start to speak about divisions, Junkers prototypes, Wehrmacht small arms, Russian military doctorine, your voice starts going down, you begin look up your eyes fully open. When you look down again, you don't know where you are.
619. When you chat with girls, first thing you ask is that in which division their grandfather(s) fought during WW2.
620. You hate someone for not knowing where is Elbing.
621. You think that total war is only form of warfare.
Part 618 happened to me. She hasn't spoken to me since that day.