Life for Americans on the south side of the fence can be a bit nerve-racking. Seeing as they're trapped behind a wall with nothing between them and the violence of Rio Grande, it's not unusual to see smugglers, illegal immigrants and high level cartel members skulking around their lawns.
By the way, things are equally weird, if friendlier, on the Canadian border. There is a street (called Canusa Avenue) that sits directly along the U.S./Canadian border -- and we mean the eastbound lane is in Vermont, while the westbound lane is in Quebec.
Guess which side the 19-year-olds can legally drink on.
Keep in mind that ever since 9/11, the USA has been a lot less casual about people driving in and out of the States, even if you live in a place where "driving out of the States" means "backing out of your driveway."
Still, road repair is totally ignored.
If you're an American living on the south side of Canusa Street and you want to leave your house to the right, you're safe. Back out and turn left, however, and you've left the country -- and you have to pass through a customs office, even if you're just grabbing a quick bite at McDonald's.
"Could you please hurry up, I have ice cream in the back!"
Turn the wrong direction down Canusa Street, and you'll now need photo ID and proof of citizenship. Oh, and they often search your car randomly as well.