I totally agree with Dale.. and I think it's hard for some people to say "thank you" in Brazil..

I am brazilian and I have lived a good portion in my life in the US.. the funny thing is, whenever i go to back to the US, I have the impression that americans overthank everybody for everything.. whenever I'm back to brazil after a long period of time in the US, I have the impression brazilians don't thank enough..

I really think it's cultural... in most american homes children are brought up having to say thank you all the time.. sometimes they dont even mean it..

it's very common to go to Starbucks and hear stuff like:

-Hi! Can I have a mocca, please?

-Sure

-Thank you

-that will be 3 dollars

-thank you.. there you go

-Ok. Here's your mocca.. Have a good day

-Thank you, you too

-Thank you

That conversation would sound somwhat strange in portuguese but extremely common in english...

By the way.. that doesnt mean people on here shouldn't thank the people who answer their questions or that the kids Dale gave his knives to shouldn't have thanked him.. thats rude!