It is if you're a teenage girl. If you're over the age of 30, then it's kind of totally crazy.
Let's face it, teenage girls didn't get their reputation for being crazy by accident. That reputation wasn't made up last week, it's got loads of documented history behind it. We're talking hundreds and thousands of years here, over many continents and cultures, so everyone can stop pretending it's some sort of unfair sexist stereotype. Females, especially young ones, are completely unstable.
Oh I know, lots of girls and even a few guys will call me a sexist bastrd for saying that. And they won't be wrong, but notice one thing: Notice how none of them will call me a liar. That's because they know I'm right.