I saw the thread about the nicest celebrity you've ever met, so in response, who is the least nice celebrity you've ever met?

Some years ago, when I first got my driver's license, my mother sent me to the grocery store to get groceries. After I grab everything and head toward the checkout line, I see Tommy Lee Fucking Jones. I got really excited because I really love the MIN series and I thought he played his role in No Country for Old Men really well, and I wanted to let him know I appreciated his work. As I walk up to him, without even looking towards me, he sensed my presence and said "Look kid, I know you like Men in Black, I don't want to hear it." Then he grumbled for a bit, put an item in his basket, and left. Ass.