There’s a funny moment in Apocalypto when a tree falls in front of the group of walking Mayans, and one of them says (in Yucatec Maya): “I’m walkin’ here!”
Anyway, here’s a few more I say pretty regularly:
“I’m not so sure about your police work, there, Lou” (Fargo)
“Mynameiswartz?” (Being John Malkovich)
“Achhay high five!” (Borat)
Wow, that is a deep cut! I like it.
I’ll frequently say “I’ll be back” in a schwarzeneggarian monotone when I’m leaving someplace. I’ve used it so often that I’m sometimes surprised when people react to it.
We also say “Have Fun Stormin’ the Castle” when one of the household goes out on something adventurous. But not D&D. Pepper Mill hasn’t played an RPG in ages.
I don’t do this one in public, but with our son, my wife and I will look at each other and say, “…got lost in his own museum, eh?”
It’s from Indy 3 describing how bad at directions Marcus Brody is.
I will channel my inner Tor Johnson and state “Time For Go To Bed” before hitting the sack. I will often modify it to fit the task, such as “Time for Make Dinner” or “Time For Go To Gym.”
From A Funny thing Happened on the way to the Forum;
I shall be back in a nonce. Or at most, two nonces.
When going to the restroom, I occasionally say “I shall return” in my best imitation of Gregory Peck’s imitation of General MacArthur. As I get older, fewer people find it funny.
From Murder By Death
As you can see, I can see.
First time I used it with Mrs. Cad she was, “What?”
I use that one all the time! Along with some variation on “A thousand thanks, whichever one of you did this.”
I do the same. And - yep.
Depending on who’s cooking, my wife or I will announce that dinner’s ready with, “It’s hot, it’s brown, and there’s plenty of it!” (City Slickers)
The other day, I hit a big pan lid with a serving ladle and exclaimed "Master! Dinner is served!’ (Rocky Horror)
A buddy and I just to shout out, “I’m all over that, Rose,” (from Don’t Tell Mom the Babysitter’s Dead) whenever we were asked for anything at work.
I’m a fan of “Dishes are done dude!”
As a fan of Murder by Death I endlessly quote it (it’s really a dialogue film, as opposed to Clue which is much more physical).
“What meaning of this”
“This can only mean one thing…and I don’t know what it is”
Why me?
“Because your mother not here to do it”
“I like her, I really like her”
And do on, endlessly.
As a Boomer who has hundreds of one-liners from movies, shows, and records (Newhart, Cosby, Firesign)…
No one besides you thinks it’s funny.
Sorry, but if you’re saying these things, do so to amuse yourself.
Which, I keep telling my family, is reason enough for me to spout a clever line (at which point one of my kids will say, with a cocked eyebrow, “I DO hope you’re entertaining yourself…”).
Slight nitpick - “Dinner is prepared!” 
Yeah, I worry that we’re just impeding communication, all of us with our little in-jokes that no one is actually in on. I do it too, but it’s not a positive trend.
You should see the other guy.
‘At first, I admit, I was afraid; yeah, I was petrified.’
Somebody usually feeds me the second line.