I loathe 'Can I get..?"
If I were serving I'd want to say, with emphasis, "Can I get YOU something, unless of course you want to go and get it yourself?"
We were sitting down to lunch with friends a while ago. Their lad, recently returned from University looked up the table and said "Can I get the salt and pepper?" His mother replied, "Well thanks for trying to be helpful love, but it's already on the table." His father also told him to ask for things properly, unless he really did have an urge to come and collect the salt and pepper from the far end of the table. It was all good natured and he laughed and the other young people chimed in too.
The world needs pedants!