Can (a==1)&&(a==2)&&(a==3) evaluate to true? (and can it be useful?)

Question

Inspired by another question regarding java-script language. Can the expression

 (a==1)&&(a==2)&&(a==3)

evaluate to true i

Answer 1

Yes it can:

class Foo
{
    public:
    bool operator==(int a)
    {
        return true;
    }
};

Then, let a be of type Foo and voila.

Can this actually be useful? I don't really see it being useful no.