Gaurav - I am a Sikh myself...but I don't think this story is true. I agree with all the fights that Sikhs did and saved many Hindu women, etc- but I don't think this story is why the '12 baje' thing started. It's just one of those jokes which has no origin. I think it came more from the saying...'tere chehre pe kyoon bara baje hue hain". Oh well...whatever the case may be - most of these jokes are hilarious and crack me down. Infact lately, it's only the 'sardar' jokes that make me laugh:)