Take a bite every time...
Someone asks about your love life.
Someone asks how finals went.
Someone asks about your plans after graduation.
Someone mentions an ex (yours or theirs).
Someone brings up politics (eat two helpings every time someone mentions Trump).
Someone starts complementing your siblings about all of their accomplishments.
Someone starts drama at the dinner table.
Someone complains about traffic or the weather.
Someone asks what clubs you are involved in at school.
Someone tries to get a family photo.
Finally, when they all fall asleep in front of the TV, take all of the leftovers and run.