Anyway, I'm in the grocery store today, and I found myself having to administer 'The Look' twice. The Look is an effective tool used to communicate your complete and total disgust, with a person. You must remain still while giving The Look, or else it's just a glance. Your face must be devoid of emotion. The Look is purposeful...and powerful.
First, I gave The Look to this 10 year old girl who was coughing and heaving near the meat department. You know the kind of cough that throws you into a wretch? That's what this little heifer was doing. I stood there and gave her The Look, as I was thoroughly disgusted at this point. Wanna know what happened? She covered her mouth! That Look is something else, let me tell ya. It shames people on site and causes them to correct their behavior.
The second administration of The Look came while I was checking out. This toddler was screaming his head off in the basket in front of me. His momma just ignored it as I'm sure she has grown accustomed to this noise pollution. So while she's putting her groceries on the belt, he's wailing, and starts looking all around her, looking for backup and reassurance. He looked at me, and I gave him The Look which read, "You look so ridiculous right now. No one is impressed. Shut it The Fuck up." Wanna know what happened? He looked down, put his fingers in his mouth, took a breath, and ceased with the bullshit.
I suggest developing and practicing a 'Look' of your own. Trust me, you will need it, especially while driving.