"It says a lot that over a long 16 year career theres only two incidents that Andre haters can think of where he supposedly behaved poorly on court."
Well, to be absolutely honest there are a lot more out there that people don't know about, particularly during his darker years in the late 90s and early in his career.
He certainly seemed to have a ready quip to hand for every opponent. Witness the 96 Atlanta Olympics where, having defeated Wayne Ferreira in the semis in the one match where Ferreira actually managed to grab a set, he was told that the South African had commented he was surprised Agassi wasn't defaulted for his behaviour during the match.
"That's about the only way he would have beaten me," he responded dryly.
I'm not trying to label him as some kind of on-court delinquent, but people have spoken about how he needs to maintain an intense on-court focus and when that gets distracted by anything, for instance the Clinton arrival and the line-judge controversy at Roland Garros and Wimbledon '01, his behaviour and his play become highly erratic.
The most recent, obvious example was the controversy in TMS Paris in the Moya quarter-final, where the umpire overruled an Agassi ace and called it a fault and got a "No f**king way!" from Agassi as a result.
It's a very rare occurrence, but it's one of the reasons why he's never been able to maintain the same consistency as Sampras (the other one being, of course, that he doesn't have the handy tactic of smacking an ace every other point and has to rely more on his brain and groundstrokes).