From what I've heard, having a mad family is actually considered 'normal'. If your family is sane and predictable, chances are something is wrong, and you have my sympathies. As for me, despite all evidence to the contrary, I suppose there is hope.
Allow me to illustrate.
/Scene1: Kitchen, during dinner. Radio is on for the news/
[Mom, me and bro talking loudly about random topics]
Dad: Be quiet!! Can't you see I'm trying to listen to the news???
[Over the radio: "..... Chris Brown has just been released from jail, and the rumour is that girlfriend Rihanna's last minute no-show at the Grammy's may be tied to his assault..."]
/Scene2: Kitchen, during dinner/
Mom: Gehan, this Beyonce - when did she get married?
Me: [taken off guard] errr.. some time ago I think. Why?
Mom: Hmmm. She got in trouble with some old black singer recently no? Because of the song she sang at the Inauguration Ball?
Me: errr.. yeah, Etta James actually. But how did you....?
Mom: She's a nice girl actually, though she dresses - aggressively. But she has a split personality no?
Me: [shock]Yeah, how did you....?
Mom: Yeah, and the other persona she's called some "Sasha Fierce" or something no? That's why on stage and all she's so - aggressive.
Bro: [with mouth full] HUH?? What?? Really??
Me: [marvels at how his 50 year old (sorry mom!) mother knows more about Beyonce than his teenage brother, and wonders if that's a good thing or a bad thing]
/Scene3: Kitchen, after dinner/
[Me trying to convince bro that some weird tiny growth behind his ear is proof that he is actually a Klingon]
Bro: Here shutup! Ma...!! Look what he's saying....!
Mom: It's ok, lots of people have growths..
Me: Yeah, at least it's not like my friend. He has an extra thumb. Even that actor Hrithik Roshan has one.
Bro: What??? Really?? But he's an actor!! Do they show his hands in movies?
Me: .... no, he does all his scenes in a straitjacket...
Bro: ... Wait! Is he married???
Me: [wonders what this has to do with anything] err.. yes...?
Bro: What??? Who would marry someone with an extra finger?? What's wrong with her???
Me: [looks at mom. Mom looks at me. Wonders where we went wrong with the boy]