The assistant askes "Are you Irish?"
The guy, clearly offended says "Yes I am. But let me ask you something. If I'd asked for Italian sausages, would you have asked if I was Italian? Or if I'd asked for Bratwurst would you ask if I was German? Or if I'd asked for a Kosher hot dog would you ask if I was a Jew? Or if I'd asked for Chorizo would you ask if I was Spanish?"
The assistant admits "No, I probably wouldn't."
The customer says "Well then, just because I asked for Irish sausages, why did you ask whether I'm Irish?"
The assistant replies "Because you're in Halfords." ( A UK Automotive shop)
