You must be joking, aren't you/mustn't you?

[joham]

When native speakers say 'You must be joking' or 'You can't be serious', do they often use a tag after them? If they do, what tags are they?

You must be joking, aren't you/mustn't you?
You can't be serious, are you/can you? Or something else?


Thank you in advance.

 

[bhaisahab]

When native speakers say 'You must be joking' or 'You can't be serious', do they often use a tag after them? If they do, what tags are they?

You must be joking, aren't you/mustn't you?
You can't be serious, are you/can you? Or something else?


Thank you in advance.

It's not common to use a tag after either of them.