People who were fired on their first day at work/saw somebody get fired their first day at work: What happened that led to the firing?

When I worked at a movie theater, I was showing a new hire how to prepare pretzels. After I sprayed a little mist on them and was dribbling some salt over them, he said something along the lines of, "Man this is too much," took his vest off, and went to find a manager to hand it to.