#WorldSandwichDay - What makes the perfect sandwich?

It's International Sandwich Day and we thought a little sandwich trivia is exactly what you need for a water cooler conversation.

Many would agree that what makes a sandwich is any filling in between two slices of bread, but it's not that simple according to The Atlantic.

They say a sandwich is 1) having two exterior pieces of bread or bread-like product,

2) mostly horizontal in structure,

3) portable and

4) containing more than just a condiment (no, ketchup alone is not a sandwich)

But it's still confusing...

New Yorker's believe that a burrito is a sandwich, but in Massachusetts feels differently. The Atlantic believe a burger is a sandwich but not a hot dog?

The largest-ever sandwich, according to Guinness, was a corned-beef monstrosity made in 2005 by staffers at Wild Woody's Chill and Grill in Roseville, Michigan weighing more than 2 tons!

The longest sandwich ever was made in 2011 in Beirut, Lebanon, and measured more than 2,411 feet - 735 meters!

And the most expensive sandwich is a "Quintessential Grilled Cheese" from New York and it comes served with South African lobster tomato bisque as a dipping sauce $214- R2 881.20!

This is how Twitter users celebrated #NationalSandwichDay