It must have started with someone wanting to sell a Minty Green Ford Focus.
The seller has a great sense of humour and it makes all the difference to his listing. Then people posted questions, and he replied, like the following:
Q: Hi, I’m interested in your car, is it be compatible with Windows XP?
A: Hello I represent the ford focus in stunning mint green. You will require a dongle to integrate this with XP.
Now it is being posted on various Facebook pages. Read all the comments. It will be a sensation.