Pull the other one, it's got bells on

Posted by Yasmin Mazur on March 30, 2003

Can someone help me with the ORIGIN of THIS expression?
I'm not looking for it's meaning, I know it's when someone doesn't believe what was said. I'm not looking for the origin of Pulling my leg either - just the phrase Pull The Other One, It's Got Bells On.
BTW - what is the connection between the bells and someone's leg? Doesn't seem relevant, just two expressions that got confused together.