1. Are you kidding?

2. Are you kidding me?
3. Are you pulling my leg?
4. Are you teasing?
5. Are you teasing me?
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Are they all grammatical and the same in meaning? Can we use 'legs' in #3? Where can I get to know the origin of 'pull one's leg' in a simple version?

1 answer

I answered most of this yesterday, didn't I? ¯\_(?)_/¯

http://www.phrases.org.uk/bulletin_board/9/messages/906.html