A customer asked, “In what aisle could I find the Guinness?”   
The shop assistant asks, “Are you Irish?”
The guy, clearly offended, says, “Yes I am.  But let me ask you something,
If I had asked for Italian sausage, would you ask me if I was Italian?
Or if I had asked for German Bratwurst, would you ask me if I was German?
Or if I asked for a kosher hot dog would you ask me if I was Jewish?
Or if I had asked for a Taco, would you ask if I was Mexican?
Or if I asked for Russian Vodka, would you ask if I was Russian?”

The shop assistant says, “No, I probably wouldn’t.”

The guy says, “Well then, because I asked for Guinness, why did you ask me if I’m Irish?”

The clerk replied, Because you are in Bunnings