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Crew chief Rodney Childers didnt need to see the Kevin Harvick tweet last week to know the mood of his driver.Harvick tweeted Sept. 6 a video of a bull jumping from a ring into the grandstands, causing chaos. The Stewart-Haas Racing driver tagged it with My mood for the next 11 weeks and few would argue the accuracy.If anyone can pull off bull-headedness for 11 weeks, its Harvick. He wont be the most fun to be around and he might be hard to corral, but he believes that attitude will serve him best as he attempts to win his second title in the last three years as the Chase for the Sprint Cup kicks off Sunday at Chicagoland Speedway.My mood for the next 11 weeks. pic.twitter.com/ewssWFvL7G- Kevin Harvick (@KevinHarvick) September 6, 2016Those around him saw that attitude two years ago when he won his first Sprint Cup title. They saw it last year. And the tweet last week didnt surprise.I knew that about [him] two weeks ago, said Childers as he stood in the garage Friday at Richmond. He didnt even have to tell me that.But thats the good thing about him. He can flip a switch when its time to make something happen, and I think everybody saw that last week that he was ready to go.What people saw a week prior to the tweet was Harvick going full bore on his pit crew following a struggle at Darlington. The public tongue-lashing resulted in two crew members sent to Danica Patricks team with two of Patricks pit-crew members all of a sudden pitting a championship contender.Harvick puts on the blinders and just goes. For nearly three months. It worked to perfection in 2014 when he won the title. It nearly worked in 2015, when he finished second.Is that healthy?There is nothing healthy about the next 10 weeks, Harvick said in an interview Tuesday with ESPN.com. Its very stressful. Its hard on your body. Its hard on your team. You have to be very aggressive in the conversations you have about your car and being very thorough and detailed and not overlooking anything.That comes with the territory. Thats the situation everybody is in. Its a chaotic situation that you have to try to control and maintain.Harvick will admit that having such an attitude requires a balance. He felt he did his team a disservice last year, with his closed-fist shove of Jimmie Johnson post-Chicagoland. The two had door-slammed each other, and Harvick, trying to stay out with a tire rub, ended up with a flat.The reaction to wha