9. Donny and Marie Osmond
First of all, they're still brother and sister regardless of any rumors suggesting that they've had sex. Second of all, look at them. There's no way you can buy that much tooth from Halloween Express.
8. Johnny & June Carter Cash
To us, the late Cashes' love was eternal and the realest of real. You just can't live up to that, no matter how many picnics you've had together or how many photos you've taken together... or whatever it is you couples spend your time doing.
7. Ike & Tina Turner
This one goes without saying, right?
6. Sid Vicious & Nancy Spungen
We dig the Sex Pistols. A lot. We just have a slight problem with people romanticizing Sid and Nancy's tumultuous love affair. Their relationship was only two years long and it was pretty fucked up, from what we've learned. But what the hell? If you're going for the traditional '70s punk look for the night, they'd be a great couple to impersonate. Plus, you won't have to worry about wardrobe malfunctions or party fouls.