I do not like to hurt the ladies.

We both have BALLLLSSS OF STEEEEEL.

 
Both hate aliens

We like bubble gum, yet we are both continuously out of it.

both enjoy taking a crap

We both are confident in what we do.

We're both voiced by Jon St. John.

My last name is Nukem.

I'm about as old as Duke Nukem Forever.

It took me years to come out.

We both have a penis.

We both constantly pee

we both love strippers!

We both pee in toilets...sometimes.

We buy our groceries at the same super market, I see him there on sundays usually.. Nice guy.

Duke and I both enjoy a fine cigar.

I continue to kick ass after running out of gum and I hate pig cops.

We both seem to chew through packs of gum pretty quickly.

Everybody wants to play with both of us.

we're both going to be a disappointment

We both steal lines from The Evil Dead.

Both fucking beasts.

I can see my reflection in a mirror.
 
I also have difficult distinguishing someone's face from their ass. It's a medical condition.

We are both males.

We both spent over 10 years doing nothing. 

We're both (dyed mine brown) blondes with violent tendencies

We both are out of gum.

I like guns

I ask ladies to shake it, usually I get slapped though.

We both like to harass people on Ventrilo. 

We both quote lines from cult movies and pass them off as our own.

We both have video games named after ourselves that were made in 1996.
 
And 2 chicks at the same time... Oooooooooooh yeeeeeeeeah.

I have killed at least three octabrains in my lifetime.

I'm all out of gum,

Has this been said before?

" We both have BALLLLSSS OF STEEEEEL. "

We both spent a fair amount of time controlling Duke Nukem.

We're both horribly outdated

We both have sultry voices.

We can both operate bathroom taps.

We have both been in development for 14 years

I have a reflection when I look in the mirror. 

Damn, we're ugly.

We have the same father, I understand. 

legitimately  reflective mirrors

We are both patrons for the 'Society for the Liberation of Oppressed Women' or 'S.L.O.W'.
 
We also both have feet. Equally as mighty.

We both like to work out and kick ass.
 
(also)
*We've both had a chance to travel back in time to Victorian England and kill Jack The Ripper.