
It's a regional saying. I've heard some Americans say it. It's not necessarily wrong. Every country that speaks English as a whole has different sets of grammar rules, phonetics, and usage of words. So, you are not wrong. It's more of an American saying than a British saying. Like Americans say take out when buying food to go. British people say take away. Same thing just different usage of words.

I think British English is also unique in its own way.. A lot of dialects and accents, sometimes barely understandable.. depending not only on the region but social class as well.. I remember watching something about British youths and... it was really something.. :). And sometimes, if I am not mistaken, even natives write things like "I could of done smth", can= t be only the poor foreigners because I see it so often...
Can I say that: there was a packet sitting on my desk??