Back in the 1980s when I was a teenager, I worked at a popular fast food chain. I had a stomach flu, but the manager didn't believe me and told me to come in or I was fired.
After about 1/2 an hour working in the food prep area… I felt the nausea building, so ran up front and (in front of all the customers) vomited all over the managers front side.
I said, “I told you I'm sick.” Half the customers left and the manager said I could go home and rest.