In the mid-afternoon, there are many tefillin bags lying around our school's lunchroom. Every so often, one of the boys forgets to bring his home on Friday afternoon. (Tefillin are worn every non-holiday weekday morning except Saturday.)
This means that sometimes, there are tefillin bags that are left in the school over the weekend. Our wonderful high school principal writes these "love notes" on the bags for the boys to find on Monday morning.
The note says:
I missed you on Sunday.
Please take me with you next weekend.
I'm told that ever since our principal started doing this, the number of tefillin bags forgotten over weekends has decreased significantly.