Duality jokes

Roses are red.

Violets are blue.

I have schizophrenia,

And so do I.

Genders are like the twin towers. There used to be two of them, and now it’s a sensitive subject.

The twin towers are like genders, there used to be two of them.

Slavery and discipline, it's kind of the same thing. You get whipped for doing the wrong thing.

The Twin Towers and genders have a lot in common. There used to be two, and now it's just a touchy subject.

What do the Twin Towers and gender have in common? There used to be two of them, but now it's a sensitive topic.