I beg to pardon - It's the British way of saying, 'What the hell did you just

It's the British way of saying, 'What the hell did you just say to me?' like you're in a fancy restaurant and you're not going to throw a tantrum.

'I beg to pardon?' he said, clearly annoyed but trying not to shout.

'I beg to pardon? You just said I'm a lousy driver.'

She said, 'I beg to pardon? You called me a disgrace?'