Do you stand "in line" or "on line"?
Last month, there was a discussion about the proper terminology used when discussing the word "party" in this thread.
I thought of this again the other day while sitting in one of my favorite Manhattan diners (The Tic Toc Diner (Check it out if your in town. 
)
Anyway, someone from "way out of town" wasn't sure where to pay. A waitress told the customers to "stand on line" by the register in the back. This is the way we commonly use this expression in this part of the country. We say "stand on line"
I was standing on line at the bank.
If you want tickets for that concert, you are going to have to stand on line for hours.
The customers were of course confused until another customer shouted out "stand in line". This expression definitely predates the use of computers and has nothing to do with "going online" on a computer.
I don't think this would be called an idiom. It is just a simple change in vocabulary from region to region.
Can you think of any others in the English or Spanish language that could cause confusion to beginners(and even those who have been at it for awhile)?
