Whether you're a Big Mac or Chicken Nugget type of person, most people have their McDonald's favourites.
The fast food chain serves approximately 70 million customers daily through its restaurants worldwide - with 3.8 million of those in the UK, and another 25 million in America.
And a while the menu changes regularly to keep up with trends and tastes, it has long been rumoured that there's also a 'secret menu' for diners to order from.
Now, an ex-employee has shared the truth behind the rumours, and even revealed how customers can order from the hidden menu.
Taking to Reddit, he said: "I worked at various locations for the business for many years to fund my way through college.
"The same could be said about many of my coworkers when I was at locations nearer to a college/university campus.
"After hearing about how much mystique the secret menu seems to have, I thought I'd shed some light on exactly what all of these sandwiches are, and why some of them exist."
The crew member, who worked in restaurants across America, went on to explain how each store's take on the 'secret menu' is different - with some outlawing it and others playing into it.
He added: "For secret menu items, what tends to matter for availability is not the owner, it's the on-duty manager and location of store.
"There is no secret menu, really. What these are, are 'menu hacks', combinations which aren't on the menu, but are possible with the ingredients found around, some more ingenious than others.
"What matters is if the manager on-duty will actually let you do these things."
He says customers can "maximise their chances" by visiting restaurants near a college or high school, as its workers are more likely to go along with a customer's request without questioning it.
"[If you go] any time after 7pm, you will have infinitely better luck than during a lunch period, as lunch is when most stores have their most rule savvy managers on duty," he added.
Sharing popular 'secret menu' items, he says customers commonly ask for the McKinley Mac, which is a Big Mac meal with Quarter Pounder meat.
He said: "It'll be kind of expensive but basically any store will do that for you as far as I know."
The ex-employee says customers sometimes order a grilled cheese by asking for a plain cheeseburger with no meat, in an attempt to recreate cheese on toast.
"If you ask for this, look at the receipt, if the cashier was new you'll see 'Ask Me' written on it, but if they knew what they were doing you'll see 'Plain, No Reg Meat' or something of the sort on it," he said.
"Quality will vary based on how hot the bun was vs how cold the cheese was.
"I personally don't suggest it (it's the heat from the meat that generally melts the cheese most), but if you want a grilled cheese, that technically is one."
The worker reminded customers that ordering 'secret menu items' could end up costing them more money - or leave them feeling embarrassed after uttering their made up names.
He said: "The McGangBang (McGB) is only going to generally happen in a college town or the like, and with a lax manager around, specifically because of it's name and they don't want other more sensitive customers to be hearing those words.
"If you want a McGB, you're better off generally asking to have a McChicken and McDouble put together, rather than saying the name.
"For other mix sandwiches, generally same rules as the McGB, sometimes you'll land a hit, sometimes not. If not, you'll just be told you're welcome to order them separately and put them together yourself"
Commenting on his post, one user said: "I used to make a quadruple cheeseburger on my own out of two doubles. I was tempted to ask them to just do it for me and save the extra bread."
Another user added: "The McKinley mac is only in Alaska."
A third user said: "I was drunk and ordered a McDouble with six extra patties and six extra slices of cheese. It cost me $9.08."
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