I saw this on Dick van Dyke this afternoon. Rob overheard Laura planning a surprise birthday party for him and thought she was having an affair. Hilarity ensued.
I dunno… can we really say that merely depicting a common everyday conduct is “a trope”, unless it’s something that actually has relevance to the story? So “person X is unreachable until they get to the office or back home” and therefore things happen he could have prevented, is a trope that goes extinct due to cellular phones; but standing for a lady, or going to the ballgame in a suit and fedora hat, was just a depiction of the world as was.
Somebody ordering a delivery pizza and accidentally getting one with anchovies.
Maybe it was far more common in the 1980s but Dominos and Pizza Hut have never had anchovies for as long as I’ve visited them.
Or, while ordering, they specify “no anchovies.”
The smoking cigarettes in bed to indicate the characters just had sex.
There was a jokes thread here where someone remembered one of my favorite cartoons: A snooty waiter is whipping off the lid to a fancy tray and announces, “It’s a fried telephone book! We gave it a fancy French name and you ordered it!”
Married couples sleeping in double beds. Does anybody really believe that Rob Petrie didn’t bang Laura as soon as Ritchie was in bed? 
One that you still see for now but I’m sure is on its way out (given the focus on concussion, traumatic brain injury, etc.) is the comedy “knocked out” cartoon routine. Where a character gets hit on the head, is momentarily knocked out and gets up with birds singing around their head (or some similar comedy device) and then continues on like nothing has happened.
Its not a just a thing from old Hanna Barbera cartoons, I’ve seen it in recently made cartoons my kid watches. I’m a bit “err that doesn’t seem like something we should be teaching kids about handling head injuries”
From the episodes of Bonanza I’ve been watching, it seems someone is whacked over the head with a pistol butt at least once every day.
Either that or there’s a fistfight with bone-crunching blows to the face that would snap a man’s neck IRL.
Yes, it does:
From Burke’s Law
Twin, not double.
Husbands spanking their wives.
Oh my god! That bowling ball !
It’s my WIFE !
I am 100% jealous of you for getting to post that before me.
Someone did this once at a place where I worked. They had to run the dishwasher several times while empty before it stopped filling up with suds. It was in the 1990s (I don’t remember exactly when), and just about every household had a dishwasher by then. So this sitcom trope happened in real life at least once.
I can confirm this, I did it once myself. About 25 years ago, I was in a hospital, and every week one patient was picked for kitchen service for the station’s coffee kitchen. Part of the service was filling and running the dishwasher. When it was my turn, never having owned or operated a dishwasher, I put in regular dish soap, and within a few minutes the not very big kitchen was half-filled with suds. I was very embarrassed and had to clean the kitchen to boot. The staff consoled me by telling me that I hadn’t been the first one to let that happen.
The “Dead Horse Trope” link that @NDP posted upthread is a fascinating rabbit hole with a number of side tunnels, such as the “Dead Unicorn Trope”, which is a trope that was seldom or never played straight before it came to be played much more often and exclusively as parody. The “needle scratch effect” is included in that list, as well as a few other interesting examples:
- Black Dude Dies First: This trope is far more often parodied and lampshaded than it is played straight. A review of all the major horror movie franchises will show that if there’s a black guy at all, he’s usually either one of the last to die, or even one of the few survivors.
- Likewise, the horror trope that the Final Girl is always chaste and virginal and utterly virtuous is, if not wholly untrue, certainly not the hard-and-fast Rule of Horror it’s often presented as in more “self-aware” horror movies. Classic Final Girls of the slashers of the '70s and '80s could have boyfriends, smoke pot, and, yes, have sex, and still survive the movie.
- Brain Food: The idea of zombies eating brains is commonly believed to come from the 1968 film Night of the Living Dead or one of the many zombie films that followed it immediately afterward. It doesn’t; in fact, it comes from The Return of the Living Dead , which was released in 1985. And that film is a much more comedic and less serious take on the zombie movie genre than most other zombie movies…
- Timmy in a Well: While the trope in general is not a dead unicorn and is closer to a Discredited Trope, the often parodied version of the trope that it is named for is a dead unicorn. Timmy never actually fell down a well in Lassie even though he did get into all kinds of other crazy situations that his Heroic Dog saved him from by getting help.
I could have sworn the ‘black dude dies first’ was an often played straight trope before it became a parody, and also the “chaste, virginal final girl”. I saw a lot of bad late 70s-80s horror movies, and the final girl in Friday the 13th fit the bill, as well as a classic of the genre, “Chopping Mall” in which, out of 3 couples, only the nerdy couple who choose not to fool around survive. That’s two right there just off the top of my head.
"Brain Food’, on the other hand, I was aware that it was never played straight, also having seen a lot of bad zombie movies, and I remember The Return of the Living Dead as the first and as far as I know, the only zombie movie where the zombies exclusively want ‘braaaaiiiiins’. Also it was one of a very few instances where I’ve ever seen zombies that are able to speak at all, and it was definitely a comedic take (at one point, zombies overrun an ambulance, kill and eat the drivers’ brains, and one zombie gets on the CB radio and says “sennnnnd mooorrre ambulances…”.
That vehicle is too slow, no acceleration whatsoever 
The idiot husband who keeps squeezing the metal charcoal starting fluid can, with the resultant mushroom cloud.