Ronnie O'Sullivan took off his shoes mid-match at the Crucible on Tuesday - but still socked it to debutant Craig Steadman.
The Rocket raced into a 7-2 lead in his first match at this year's Betfred World Championship in Sheffield. But five-time champion O'Sullivan, 39, could now face a fine after breaching snooker's strict dress code against the 32-year-old from Manchester.
O'Sullivan almost made a 147 maximum break in the first frame - missing the 14th red on a run of 104. But he played the sixth frame in his socks after removing some new shoes, complaining about a painful big toe.
O'Sullivan saw his lead pegged back to 4-2 after losing that frame - and tried to hand his footwear to a fan. He also asked: 'Does anyone in here have some size eight or nine shoes I can borrow. I'm serious?'
But tournament director Mike Ganley summoned him out of the arena and lent him his own shoes for the last three frames of the session.