P PLEASE

I do various timed tests, drills etc. in the classroom. When we do a multiplication timed test, we switch papers and correct them together. There are 100 problems on a page and the rows are lettered instead of numbered. The first row is A, second is B, and so on. I call out "John read A, Sue B" etc. We were on letter P and without thinking I said "Daniel, P for us." The class didn't catch on until I started to giggle when my mind "saw" the phrase "Daniel pee for us." It took us several minutes to get back under control. I haven't made that mistake again. :)