The offender was sitting behind the basket at the Wollongong Entertainment Centre on Wednesday night when Thornton slid into the advertising boards in front of him. He then decided, for some odd reason, to pour the contents of his beer can on the unsuspecting former NBA Draftee. The Hawks went on to win 96-90.
Needless to say it left Sydney Kings coach Damian Cotter seething.
"That has to be dealt with," Cotter told AAP afterwards.
"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."
Watch the incident here:
What the hell? Some old bloke just poured beer on a @SydneyKings player #hardball pic.twitter.com/ozNJHriuvv
— Andy Cussen (@Cussen91) November 25, 2015