I should note that when I finally got to go to (private) school, after being spottily "homeschooled" till age 9ish, I once faked being well in order to go to school. I remember it well, since I put the thermometer up on top of my tongue and occasionally took a breath of air around it.

I felt absolutely horrible around lunch and had to be picked up, and never did that again. But I did do it once!