Is this normal behavior for an adult?

[Jimmy K]

My sister seems to live in this fantasy world - she gets seriously obsessed with a movie or tv show and for months you can barely get her to talk about anything else and she talks about the characters like they are real people she knows. She learns every single thing ever about the show which is fairly impressive if I didn't think that she really thought she lives in the world.

Usually she gets this "crush" on someone too - currently its Dwight from the office, well... Rainn Wilson the actor specifically and if you didn't know they were famous from the way she talks you would think it was someone she was honestly dating. She says she talks to them (she means she writes on their facebook and tweets at them) and things like that.

So... if she was still 13 it would be cute but she is 27 and its kind of creepy. She has like no friends at all - I mean she holds down a steady job and has a house and keeps all her life straight that way but it seems really abnormal that she goes so crazy intense about tv shows. Should I try to say something to her?

Also, she is a pretty girl and always has boys after her, most of them that meet her at work but she never EVER goes out on any dates. She's never once shown up to a family event with a guy (or girl - we wouldn't care)!

[Thomas]

I think you sister may suffer from a form of Erotomania - you can look this up but it usually involves a romantic love obsession with an un aware and uninvolved media person

[Julia]

You should probably bring her to therapy for extra help. You also should try to talk to her of get her on a date but she seems like something's not right

[Ibleda]

I'm sorry... for a girl, or rather, I would do the exact same thing if I dared. Yes, 27 is a bit over the fantasy age, dreaming of her prince on white horse... but...

It depends on what you consider normal, what side of the world. But I would never ever let "it is not normal" slip out of my mouth. Well simply put, I'm the same as her, got a crush on an singer/actor >.>.

There are plenty fans that will go all out for whatever they like, but for someone who isn't a fan of that... it looks different.