Two trade mark stories for the price of one. Something a
Scotsman would be happy with!
Trade mark story one: It's Finger Lickin' Good
There's been much in the news about the fact that KFC has
temporarily ceased all use of the strapline It's Finger
Lickin' Good. A strapline (or slogan if you prefer) is, of
course, as much a trade mark as a brand name or logo, and
straplines can be, and often are, registered.

image source
The company has done this because, in the words of a spokesman,
"right now our slogan doesn't feel quite right". Or,
in case that's a bit obscure, because "we find ourselves
in a unique situation - having an iconic slogan that doesn't
quite fit in the current environment". Still confused? Ok
then, the company feels rather awkward about encouraging its
customers to lick their fingers, when the only thing people are
being advised to do with their fingers these days is wash them very
often!