This is so ironic. There is already a movie (Rien a Declarer / Nothing to declare) whose main premise is a guy spending his nights slightly moving the border between France and Belgium: https://www.youtube.com/watch?v=Q6MljTh0kws (This extract is French only unfortunately :( )
Trailer: https://www.youtube.com/watch?v=piQPaxlZWu4 (With English subtitles)
But, as someone who grew up less than 100 meters from this border, I'm pretty sure this stuff actually happens all over.