I teach a class on both sides of a lunch break. It's not uncommon for me to lose students over said lunch break: either they disappear to another class to catch up on missed work, get called down to speak to another teacher, do something at lunch that lands them in the principal's office, or nick off and force me to fill out a truancy slip.
I'd say that, with that particular class, on that particular day, I probably lose 3 on average over the double (more if they've been getting in trouble together).
I'm a genius! The "special late desk" seemed like a brilliant invention, and as my first latecomer (Doug) arrived, I put it to good use:
Right then, I loved the special late desk. I wanted to marry the special late desk. I had grand dreams for the future, and all the magnificent times that the special late desk and I would have together.
Then there was another knock at the door:
I'm a genius! I manage to fit a second 'special late desk' into the front of the classroom with minimal disruption, and successfully embarrass a second student into showing up on time in future (at least for a week). I even make a second little sign. I begin to launch into my spectacular lesson when:
There is no escape. Another latecomer, and then another...
Luckily, by the time I get to this point, the lesson is pretty much over, and I can start planning my next patent for the next lesson.