I did my share of yelling and sometimes you really have to have it quiet to concentrate. I would just yell out "Quiet please!" I worked in one place where the sections were numbered a, b, c, d, e and the tables ran consecutively, a1, a2 so on. It was pretty tough, under the fan, pans sizzling in your face, head in the oven, and someone is saying "Pick up c-2." I'd come up screaming "is that b-2, c-2, d-2 or e-2?" because I just couldn't hear. And they were so resistant to numbering the tables with just plain old numbers. Those waitresses used to keep miniSnickers in the freezer because they knew a half dozen would calm me down.