[Taylor]

Things I've never understood..
Which ones do you use?

Laser or Lazer
Diversion or Detour 
Dressing Gown or Robe
Film or Movie
Flat or Apartment
Full Stop or Period
Harbour or Harbor
Humour or Humor
Metre or Meter
Post or Mail
Lift or Elevator
Lorry or Truck
Mum or Mom
Favourite or Favorite
Reckless or Wreckless
Cosy or Cozy
Oven or Stove
Candy Floss or Cotten Candy
Nappy or Diaper
Neighbour or Neighbor
Note or Bill
Trousers or Pants
Petrol or Gas
Pavement or Sidewalk
Prawn or Shrimp
Rubbish or Trash/Garbage
Sweets or Candy
Tyre or Tire
Tube or Subway

Why can't we all just speak the same... :/

[George]

The correct one.

British English.

[SirWulf]

As a northern American citizen I say...

Laser, Detour, Robe, Movie, Apartment, Period, Harbor, Humor, Meter, Mail, Elevator, Truck, Mom, Favorite, Wreckless, Cozy, both Oven and Stove, Cotton Candy, Diaper, Neighbor, Bill, Pants, Gas, Sidewalk, Shrimp, Trash, Candy, Tire, Subway.

It is interesting how diverse languages can be, especially considering it is the same basic language, English. Even here in the US there are many variations depending on where you live.

[Toxic]

'Murica just being better as usual.

[Mr.Sir]

[GRiiM]

Oh you silly yanks.

[Toxic]

Oh you silly yanks.

Cheeky limeys

[RK-FIN]

In Finland the English teaching is heavily based on British English but American English is allowed too to be used.

[Welker]

None of the above

[Innovative]

[Overlewd]

Correct me if I'm wrong but Reckless and Wreckless aren't interchangeable. In fact I'm pretty sure wreckless isn't an actual word because it is even underlined in red as I'm typing. Reckless is correct in both "languages". Wreckless is a made up word meaning "unable to be wrecked" or something similar.

For most of the other ones, it depends mostly on my mood, I don't see a pattern.

[Aviator]

Also, just to let you know, laser was originally an acronym:

"light amplification by stimulated emission of radiation"

[Soviethooves]

You know what the U stands for in the British English spelling? U stink.
*Eagle Screech*

[Zombie]

American English

[SirWulf]

Wreckless: Without causing or suffering a wreck.
Adjective

1. Common misspelling of reckless.

It is recognized as a misspelling, however it is now recognized as a word due to its urban use. It is now in the dictionary. Same as in a lot of words out there.