I have discovered ways of enforcing discipline without disrupting the class or embarrassing the student. First I give a look, move towards, or deliver a note the student. If that does not work, I fill out a referral and leave the name blank. I tape it to the wall and tell the class if there's anyone who just cannot help but talk, that person should come forward, put their name on the referral and talk with the assistant principal. This usually does the trick.