Some people don't realize that if you park out in a field, they can hitch hike home in/on your car. I have brought home at least two that way. How do I know? Because I was at a cruise in and we all parked out in a field a day or two before I found them crawling up the screen door trying to get out. And my garage is pretty much sealed up- plus the fact that I have no ticks in my yard.