I worked for an audio manufacturer for years named 'JL Audio'. In many aspects, a David amongst Goliaths of completion which had large OEM sources of income and big box accounts. JL Audio had its name, it's impressive patent portfolio and it's US team of engineers and manufacturing. The company rabidly protected all of its intellectual property.
One day somewhere in The South, a man opened a store and named it 'JL Audio'. So we called the man and the conversation went something like this:
"We're calling to let you know that you can't call your business 'JL Audio' because that is our trademark"
"Well, 'JL' are my initials"
"OK, but 'JL Audio' is our trademark and you can't use it"
"You have a trademark on my initials?"
"No sir, we have a trademark on 'JL Audio' and we're asking you to change the name of your store"
"Well ok, as long as you guys pay for my new sign, business cards and shirts for my staff"
"No sir, we won't do that, this is a courtesy phone call asking that you change it before we sue you"
In short, the man refused, was sued and went out if business before it was even resolved. I have many more examples from my time there including registering all of our product images so eBay would shut down auctions with our images... got a lot if hate emails on that.
Kooler than Mudd.