Airplanes!!!! 1-3 jets from the army come fly around for about an hour, several days a week sometimes. In one way it is nice because I get a free show(Rolls sharp dives, etc.), but they are so loud I can here myself yell at the top of my lungs. So of course birding is done.
Cars. For some reason people think they need to drive down my gravel road (Which I bird regularly) at 60MHP, that they have no reason to be on, you have to go out of your way to get on it. And there is a perfectly nice hwy that runs quite close by.