500 days with summer

Tom: What happens when you fall in love?

Summer: You don't believe in that,do you?

Tom: It's love, it's not Santa Claus.

Summer:what does that word even mean?I've been in relationships,but I don't think i've ever seen it.There's no such thing as love. It's a fantasy.

There is no such thing as:没有...的事情;...不存在

There is no such thing as a free lunch. 

世上没有免费午餐之类的好事儿.