Ride my ass and I will pace the car to my right, or do a brake check.
If you're being tailgated, these are two things you shouldn't do. Pacing will just piss off the tailgater that much more and they're likely to ride you even closer. A brake check is just silly (no offense); the person tailgating you is putting you and themselves in danger by driving recklessly and trying to get in your back seat - hitting the brakes just makes a bad situation worse. They may back off, or they may not, but you're just asking for a collision by hitting the brakes.
By the way, if you think that sucks in a car, try riding a motorcycle with someone just a couple of feet behind you. I had some jackass ride up on me for a couple of miles and because of traffic there was no place I could go to get out of the way. I was behind a left-lane camper, the two lanes to my right were full, and the truck was right on my tire. I finally ended up splitting the lanes between camper-boy and the middle lane to get away from truck behind me and got outta there. Talk about annoying - a good mile of clear road ahead of all this, but everyone had to wad themselves up into a rolling roadblock.