In *It’s a Wonderful Life, * several times George Bailey unintentionally picks up a newel cap on the stairway; it comes off in his hand.
In the Original *Dragnet, * at least twice during the movie Joe Friday asks D. A. Alexander (Vic Perrin) to light his cigar.
In *Li’l Abner, * there are *two * such bits; General Bullmoose (Howard St. Jean) saying “Remind me to fire that chauffeur!” and Mayor Dawgmeat at a podium in Dogpatch, pounding his gavel, narrowly missing the hands of Romeo Scragg, Senator Phogbound, Mammy Yokum, and Dr. Finsdale.
In *The Ghost and Mr. Chicken, * Don Knotts is heckled by a man in the crowd hollering “Attaboy, Luther!”
Post here running gags and bits you’ve seen in other movies. 
And then there’s the whole switching bridegrooms thing.
Great movie.
“And it ain’t a fit night out for man nor beast.”
Needs no identification.
From I’m Gonna Git You, Sucka:
“How’d he go to the bathroom with all that shit on?”
Ron Weasley: “Bloody hell!!”
I thought I was the only one who liked Oscar! I’ve never even run into anyone who’s heard of it. What fantastic news. I’ll add
and the obvious switching of the identical black bags. “So the money, which used to be the jewels, is now your underewear?”
Eurotrip’s “this isn’t where I parked my car”
dougie_monty
How could you forget the most famous running joke in “The Ghost and Mister Chicken”? (or just about any movie for that matter).
“… and they used Bon Ami™”
I always say that when I go out on a particularly snowy day.
How about everyone sitting on the chihuahua in Hot Shots?
“Hey mister, I want my two dollars.”
“I’ve got a bad feeling about this.”
“Looks like I picked the wrong day to stop smoking/drinking/sniffing cocaine.”
This one shows up in Kingpin. The crowd calms during a crucial frame, and you can distinctly hear someone yell out this line.
“I knew I should have taken that left turn at Alburquerque.”
Some that may need explanation:
In Stardust Memories, people keep asking filmmaker Sandy Bates why he doesn’t go back to making his earlier, funny movies.
In Batman Begins, Liam Neeson constantly chides Christian Bale that he does not keep track of his surroundings.
In The Bride of Frankestein, Dr. Pretorius calls two different vices, “My only weakness.”
Dante in Clerks repeats the line, “I’m not even supposed to be here.” It’s referred to in Jay and Silent Bob Strikes Back when Dante is asked “Are you even supposed to be here today,” and he replies, “Don’t get me started.”
Glue. It’s glue he doesn’t stop sniffing.
“Frau Blücher.”
“That’s HEDLEY!”
“Inconceivable!”
“Hello. My name is Inigo Montoya…”
Muppet Movie
Character - “Don’t touch the frog, you’ll get warts.”
Kermit T Frog -“That’s just a myth.”
Character - “A what?”
KTF - “A myth, myth.”
Random Waitress from Offscreen - “Yes?”
I came in here to post:
KTF- I’m lost.
Random person- Have you tried Hare Krishna?
Does Brad Pitt’s character eating something in almost every scene count as a running gag? I loved seeing this in Ocean’s Eleven.