30 years ago when I was in Egypt I was amused by a giant advertising sign on a building in Cairo.

It was for the drink 7up.

Have a look at the arabic numerals - the thing that looks like a 7 is actually an arabic 6. I wondered whether Arabs ever think of the drink as 6up, or maybe 8up.

Later, I found the advertisers of 7up played around with their logo and turned it upside down.