This evening I happened to be driving behind one such car. It caught my eye because it was advertising a brand of coffee and tea that I hadn't heard of before: Gurman's. A little research online led me to discover why I wasn't familiar with this company. It is based in Lithuania!
Anyway, I was delighted to see that along with their brand of coffee they also have a number of speciality shops that serve over a hundred blends of tea and coffee, plus a cafe. I was even more delighted with they way they described the cafe on their website:
Enjoying the great coffee at the Coffee and Tea House “Gurmans”, situated
in Klaipėda „Friedricho pasažas“ at the old marketplace, which was also enjoyed
by the Lithuanian noblemen and gentlemen going back to the 16th century, as well
as other different kinds of coffee and tea, which you will certainly not find
either elsewhere in Klaipėda, the entire coast, or even Lithuania, you will get
into the mysterious world of drinks, commemorating the dawn of the mankind.
Coming to us will turn to some nice entertainment. You will be embraced by the
blend of amazing aromas, playful colors, and discriminating tastes.
The cakes and desserts of the House will pet your palate, and the scent of
hot buns will make you forget the ado of the day.
Here's a photo from their site:

I believe the man in the middle is having his palate petted while the lady on the right seems to have forgotten her ado. The lady standing seems to be consulting some ancient document probably from the dawn of the mankind.
Unfortunately you can't get Gurman's coffee in Dublin (so who knows why one of their cars was driving along Rathgar Road - the driver possibly forgot the ado of the day and took a wrong turn). However, it looks like you can get it from a couple of shops elsewhere in Ireland.
I must get some of their coffee! I must pet my palate!
