[swarnie]

"I beg your pardon" like "Sorry" can have multiple meanings based on the situation and inflection.

It can be used to excuse not hearing something, to get someone to repeat something preposterous or to generally reply to something shocking without actually expecting the other person to reiterate.

I hear it most days in corporate tech.....

[DonHopkins]

It's the perfect retort whenever someone expects a rose garden.

https://www.youtube.com/watch?v=2-eclUz-RYI