Popular filmmaker Karan Johar is so busy promoting his film "My Name Is Khan" that he didn't even notice actor Abhishek Bachchan waving out to him on the streets recently.

"Just passed Karan Johar on the road. And he didn't wave back! Ooooooh you in trouble now boy!" Abhishek posted on his Twitter page.

Though Johar has never directed Abhishek in any of his films, they have worked together in "Dostana", which was produced by Johar's Dharma Productions.