During an event to raise money for earthquake victims in Haiti, the two fierce competitors let the action spiral into a back-and-forth battle of who could get the best zinger. And, as most verbal confrontations do, it culminated in someone hitting a tennis ball at the other.
Agassi and teammate Rafael Nadal were leading the team of Sampras and Roger Federer for most of the night, before Sampras started taking things a little too serious for Andre. In his recent book, Agassi wrote that his foil was as robotic as a parrot.
"You always have to get serious, huh Pete?'' he said.
Sampras countered by doing an impression of Agassi's pigeon-toed walk, which caused the bandanna and camera enthusiast to go for the throat.
He pulled out his pockets and said, "I don't have any money. I just like ... I ..."
Agassi had also written that Sampras was a notoriously bad tipper.
Sampras answered by serving the ball at his instigator. Not hard, mind you. But, still, on a night that was supposed to be about charity, it definitely got weird.