I'm sooo tempted to brake check them, but I know it's not safe! I usually try to get over ASAP and let them pass. And I'll slow down a bit and give myself more space in between the car in front of me and my car. It bugs me soooo much when someone is tailgating me. Especially when it looks like they're 1 foot from my rear bumper.
And I admit that I tailgate on occasion too!