I was talking with a lawyer on Monday & he had fact-checked the original story.
A woman in California bought a coffee in McD & placed it between her thighs as she drove off. She braked hard & scalded herself & sued McD for $mm & won.
McD introduced temperature sensitive lids that changed from a red marker to brown when the temperature dropped. I've not seen these in UK or Europe.
If you tried the same now, Trump would probably order a hit on you.