.PEN.

Lost your pen=no pen
No pen=no notes
Nonotes=no study
No study=Fail
Fail=no diploma
......No diploma=no work
no work=no money
no money=no food
no food=you get skinny
you get skinny=then you get ugly
Ugly=no love
no love=no marriage
no marriage=no children
no children= alone
alone=depression
depression=sickness
sickness=death
Lesson: Don’t lose your pen, you will die.. 

p/s : Dont lose your pen. SERIOUSLY :|

love, peace!