不是玩笑

不是玩笑，如果鄰居長期占用你的土地，而你又不反對的話，那人可以擁有那片土地。

Adverse Possession laws:

If a person moves into possession of property, improves it and possesses it in a public manner, then after a certain amount of time he will acquire title to the property Even Though It Is Actually Owned By Someone Else.