We eat french fries in class. Every day.
Because they take science courses with labs and recitations, most of my students have pretty tight schedules, with no time for lunch. And my schedule is the same way. On Tuesdays and Thursdays, I teach three 80-minute classes in a row, right in the middle of the day, often followed by a meeting. I cannot survive that long without food. Seriously, I would faint if I tried it. So early in the semester, I discussed the situation with my students. I realized that many of them were not eating lunch — and often they hadn't had breakfast either. No wonder they were ready to crash by the time they got to their late afternoon classes.
I told them I sometimes bring food or juice to class, and they were welcome to do the same, so long as they ate it quietly, and when they left, removed all evidence of food. Since I teach in a classroom that's in the same building as a dining hall, some of the students will rush down in between classes and bring food back up with them, usually a plate of food for themselves and something to share with the class.
So what food can be shared amongst twenty people, some of whom are vegetarians? The answer is simple. French fries. Every Tuesday and Thursday, for my 12:30 class, at least one student will appear with a steaming mound of french fries, along with hot sauce and ketchup, and we'll quietly pass the food around while we talk.
The result is that I've been trained like Pavlov's dog. When I walk into the classroom, I begin to salivate.