Guinness World Records here demonstrates the exact wrong way to use trademarks:

Here is Fail Blogs great response:

EDITOR’S NOTE: This post is in response to an email FAIL Blog received from an attorney representing Guinness World Records Limited.

Dear Sir/Madam,

Thanks for writing us an email regarding the “Record Breaking Fail”. Unfortunately, douchebaggy cyber-bullying emails will only bring upon you more shame on your house. I am also resisting the urge to write this email in ALL CAPS.

I believe it is the duty of FAIL Blog(TM) to call out organizations when they encourage the public to do such things as “Break the record” for the “Most Individuals Killed In A Terrorist Act”. We firmly believe that our publication of your fail is protected under the concepts of fair use, commentary and non-trademark use. Please RTFM and we welcome you to teh interwebs.

Since we at FAIL Blog(TM) don’t have a legal defense department, we have complied with your request to remove the trademarked term and logo from the original image. We have used the “naughty bits filter” on the image to secure your naughty, naughty, trademark assertions. However, we have posted your email so that our audience can see why we had to remove the name of the failer from the image. I hope that this is the outcome you have expected as now NO ONE WILL EVER KNOW THAT GUINNESS WORLD RECORDS LIMITED HAS FAILED.

The full legal response can be read here: icanhaz.com/legalresponse

Cheers,
FAIL Blog