A bit OT but the only thing worse than being ignored is being patronised. A guy who works in my local coffee shop is Polish. He's pretty much fluent in English and very clever with it...but there's a woman in the office down the road who comes in and says V E R Y S L O W L Y W H A T S H E W A N T S....she points to the items as well, just in case he hasn't got the message.
I told him, if she wants to be like that, he should do a Manuel off Fawlty Towers, go to the other end of the counter and hold up a completely different item, smiling hopefully...just to pi$$ her right off.