Australian sport has reached a new low after an unfortunate dribble brought a Sydney Kings basketball game to a halt.

During the third quarter of Wednesday night's 96-90 loss to arch rivals Illawarra, US import Marcus Thornton slipped into the advertising board behind the hoop driving to the basket.

Before he could stand up again, a nonchalant fan - who appeared to be a Hawks ticket holder - poured beer on Thornton from the side line and continued sipping his beer like nothing had happened.

The fan was ejected from WIN Entertainment Centre.

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Sydney coach Damian Cotter described the incident as dropkick behaviour, while his Hawks counterpart Rob Beveridge supported venue management's swift decision to remove the courtside spectator from the building.

"That has to be dealt with," Cotter said.

"I'd be really ashamed if my club did that.

"This is 2015, not 1974. That's all I should say about it. But that's dropkick behaviour. I mean, really, how unsophisticated and how much of a drongo do you want to be? It shouldn't happen in the first place."

Captured on live television throughout Australia, just days after the A-League banned almost 200 fans, the man's act of leaning over a sponsors signage and showering Thornton with beer created a wave of reaction on social media.

The man faces a possible life ban or suspension.

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