Es curioso que a nadie se le hubiera ocurrido antes ponerle ruedas a una maleta.It's curious that no one had ever thought of putting wheels on a suitcase before.
Eres un desordenado. - Es curioso que digas eso, porque tú eres mucho más desordenada que yo.You're very untidy. - It's funny that you should say that, because you're much more untidy than I am.
Es curioso que, cada vez que digo que me gusta algo, él dice que a él también.It's odd that, every time I say I like something, he says he does as well.