What about “Guinness and Black” - blackcurrant cordial added to a pint, that makes the head go purple (why isn’t there a “barf” smiley?).
Coldy, I’ve heard that in Ireland, there’s such a high turnover that the Guinness doesn’t have to be pasteurised, but outside the country, it does, hence the quality differential. Thus, IMO, most Guinness served outside Ireland is sub-par, but things have got better in recent years. You can now get a passable pint in England, and parts of the US. I did have to send a pint back in an “Irish” bar in Bloomington, IN, because it was 50% head, and very bitter.
Personally, I am looking forward to sampling Nepalese Guinness the next time I’m in Kathmandu.