Hehehe... alas, the language differences between us here in Britland and our American cousins across the big pond are not limited to just lego's... or 'color - colour' and 'honor - honour'.
Buns.You know what these are. You're probably sitting on them now. Over here buns are either bread or cake rolls. Asking for a couple of sticky buns in a bakery here will mean Mr. Crusty the baker will give you two cake buns with icing (frosting) on the top. If I went into a deli in Manhattan and asked for a couple of sticky buns I'd probably get arrested...
Pants.You call pants what we call trousers; pants are the things that go underneath.
Muffler.To us what you call a muffler is called a silencer. In the UK a muffler is a long scarf a la Dickensian Novels. A muffler was also a derogatory name for a certain part of the female anatomy at my school, though this was probably unique to us. Try explaining THAT to a upstanding American when you are standing at the petrol (gas) station in fits of laughter...
Football.A classic example of our culture gap. To us football is what you call soccer. To you football is what we call pointless. You probably think the same way about cricket...
Baseball.In England we play a game called 'Rounders' which has identical rules bar the bat being a short baton designed to be used with only one hand. It's only played in schools. In the US, it's a PROPER game...
Hood.To our American cousins, the bit of a car that the engine sits under or place where you might live if you are a rapper. To us Brits, the part of a coat that is designed to cover your head when it rains. What you call the 'hood' we call the 'bonnet' on a car.
Aluminium.Over here we say 'al-u-min-i-um'. You say 'aloom-i-num'. Neither nation can spell the word....(Aluminiumiumium?)
Jock.In the US, big guys who like sport, women and acting macho. In the UK, a Scottish person who probably also likes sport, women and acting macho but in a Glaswegian (i.e. from Glasgow) accent. Which is probably more scary since a lot of people have difficultly understanding them... --->
ducks quickly to avoid a major slap from Wooster and Keasy
Autumn.My favourite time of year when the leaves turn orange, red and yellow. You call it 'Fall'. I prefer Autumn.
Z.The twenty sixth letter of the alphabet. You call it 'Zee'; we call it 'Zed'. A whole generation in England has had to relearn the alphabet after hearing the 'Alphabet song' on Sesame Street. Sadder still, the song doesn't rhyme with the English 'Zed'. At least the 'Numbers song' works (1-2-3-4-5, 6-7-8-9-10, 11-12, do do-do do-do do-do do etc etc...)
Tire.When visiting the garage make sure you know the difference between a UK tire (band of metal placed around the rim of a wheel designed to strengthen it) and a US tire (pneumatic effort called a 'tyre' in the UK). If you make a mistake it could be a very long and bumpy ride home.
99.In the US purely the number before one hundred. In the UK a yummy variety of ice cream consisting of a scoop of vanilla soft-scoop ice cream in wafer cone with a chocolate flake stuck in it. The cone is specially designed to allow the melting ice cream to flow all over your hand before you get to eat it.