I've had one of my products removed on ebay as a trademark infringement. It's been listed on ebay for several years, so I was a little surprised. However, after some investigation I suspect they may have a point. I'd be interested to hear your take on it!
The item is a badge which parodies the WWF logo as shown here:

As far as I can see, according to UK law WWF may have a case because I have based my design on elements of their own logo, for which they have a trademark registered for the button badge class (Class 29).
I've only sold a handful - for a profit of probably a pound! - so it isn't a problem for me to discontinue the product. But i'm curious about the case for parody in our legal framework, especially with regard to freedom of expression. I suppose one could argue that my parody 'dilutes' their trademark. But I personally think it's a bit harsh!
Additionally, and this is a technicality, the infringement notice came from a German based law firm. However, I suspect this parody would probably be fine under German law. How does that work, legally?
Best wishes!