The United Center crowd will hear a familiar bark along the sidelines tonight. After a five-season run with the Bulls, Tom Thibodeau is back tonight (7 p.m., WGN/ESPN) with the Timberwolves. But before the ball is tipped, it’s time to wax poetic. “When I look back, 90 percent of it was great,” Thibodeau said of his Bulls tenure. “And everything in life, there’s 10 percent that’s not going to be perfect, and I think you learn from everything.” OK, maybe that was a little too waxy. Let’s try that again. “I know when that ball goes up, he’ll be trying to kill me and we’ll be trying to kill him,” Thibodeau said of Jimmy Butler, laughing. There, that’s more like it.