One of his most widely-publicized feuds was his 2007-08 series of run-ins with Tony Stewart.  After an on-track skirmish at Dover in 2007, Busch roared to a stop beside Stewart's car on pit road and waved hello.  Busch lost 100 points, was slapped with a $100,000 fine and was put on probation until the end of the season.  We assume NASCAR fined him for using unauthorized hand gestures.  As if getting fined once wasn't enough, he tangled with Stewart again months later during practice for the 2008 Budweiser Shootout.  Only this time, he collided with Stewart's car on pit road - not once, but three times, and blocked him from entering the garage area.  Afterward, both drivers were called to the big red trailer where an argument ensued and reportedly ended with Busch accidentally running into Stewart's fist with his face.

Busch has also had issues with Jimmy Spencer, Robby Gordon, Kevin Harvick and Greg Biffle, but he seems to have cooled off a bit after the altercation with Stewart, probably so that his younger brother Kyle could take over the position of NASCAR's resident ass-hat.

As if he wasn't creating enough controversy on the track, Busch decided to try his hand at creating some off the track in 2005 when he was pulled over in Phoenix for reckless driving and suspicion of drunken driving.  It is unclear as to whether Busch actually failed his field sobriety test, but by the time the press caught onto the story, it was too late.  Rousch Racing suspended him for the remainder of the season, and Busch was sentenced to 50 hours of community service.  This incident turned out to be a good thing for Busch, because he had asked Jack Rousch to release him so that he could replace the retiring Rusty Wallace in the No. 2 Miller Lite Dodge.  The Cat In The Hat initially refused, but decided to go ahead and release him after the Phoenix incident.

Busch married Eva Bryan in 2006 and the couple now resides in North Carolina and travels to the racetrack together each week.