True, making a good impression isn't easy, but what is doable is not coming off like a total jerk. Be an instant winner in their eyes by simply staying away from cracking any of the jokes below and keeping the inappropriate comments to yourself, no matter how funny they might be.
Note: We have Reddit to thank for bringing us these great tips via the 'What's the worst possible thing you could say when meeting your boyfriend/girlfriend's parents for the first time?' thread. Here we go...
Daddy No. 1
"You're one sexy man. I see why she calls me daddy!" - brashdecisions
Parole Officer
Hey, aren't you my parole officer? - gulpeg
Virginity Joke
Don't worry sir, she'll never lose her virginity again! - CaptNagrom
Condom $$$
Can I borrow $5? I'm totally out of condoms. - reddituser112
Warlizard Gamer
Hey, are you that guy from the Warlizard Gaming Forums? - darryshan
In Bed
I'll have her in bed by 8 and home by 8:15! - PainMatrix
Daddy No. 2
At the dinner table, girlfriend says, "daddy please pass the salt". You and her Dad both reach for it. - Generati0nY
Family Dog
I hope that wasn't your dog outside. - a_durrrrr
No Plans
No, I don't really have any plans for the future.- akaioi
Dad's Work
Shake's her father's hand. "I'm a big fan of your work sir." - Pasalacqua87