Christian Bale's sister reportedly asked him for £100,000 (roughly $200,000) to help support her children. When he said "No," she decided to make some remarks about his wife causing a confrontation that, according to The Sun, did include "pushing and shoving":

Legal sources told The Sun the women said sister Sharon needed £100,000 to help her bring up her three children. They said Bale, 34, snubbed the plea and a row flared in his suite at the Dorchester Hotel in London?s West End. Welsh-born Bale was alleged to have ?pushed and shoved? mum Jenny, 61, and Sharon, 41.
Both Jenny and Sharon are terribly upset over what happened. They did not want any publicity and the last thing they wanted to do was wreck his premiere evening. But they say he bullied them.

Here's what really happened: Christian Bale's sister asked him for money. He said "How 'bout a check in the amount of 'I hate you.'?" She called his wife a "hose beast" prompting him to drive over her face with the insane looking Batcycle above. Then Superman showed up, and they all ate sandwiches. The End. WINNER: MOST BELIEVABLE VERSION YET!
(Source)