Texting while driving.
I have 30 minute commute on a freeway. You can see them from way back. They're in the slow lane. They're swerving like they're George Jones leaving a honky tonk at 2am. Then you see the eyes it the rear-view. They're looking down. Then quickly up to check the traffic. Then right back down. I see at least 5, sometimes up to 10 driving texters a day. 80% of them chicks. It's just so maddening.
Lately, I've been pulling beside them to try and get their attention so I can give them the "WTF?!" gesture. But I have not yet been able to pull their attention from them telling their friend that Jenny from payroll is a bitch or to meet them at Applebee's or whatever the fuck it is that they text each other.