New Zealand spoken English - slang 101

Two very common phrases

you will hear said in New Zealand are:

Yeah, nah
Yeah, right

Yeah, nah - means no. We can say this politely like we are thinking about the question or we say it almost as an expletive, "no, not likely!!!"

Yeah, right - we don't think the thing you are talking about is likely to happen.

Example: Which version of yeah, nah and yeah, right do you think I would use to reply to the following statements:
1) You ask me to go to the movies with you and I am not comfortable to go.
2) You ask me to do mud wrestling.
3) You say your friend owns a super yacht.