No, but I've turned a C&D letter and replied with a very sophisticated "fuck off" message and they were practically begging me to sell it to them and to contact them again if I decided to change my mind.
They tried to bullshit me. I called them on it and they asked me if I wanted to sell it without an apology for the C&D.
Short Summary:
Them: We own the trademark of the word in your domain, give it to us.
Me: Oh yea, prove it or fuck off.
Them: We will buy it from you.
Me: I said prove it OR fuck off. You must fuck off now.
Them: Okay, if you change your mind, email us.
edit: of course, in my case, they had nothing to go on so it might not be useful for you.