Not on Karan Johar's back. And this is not about Nargis Fakhri either. Akshay Kumar, who is known for his pranks. pulled a fast one on his Baby co-actor Karan Anand, who plays a baddie in the upcoming film. 
While shooting in Istanbul, Akshay started talking about Karan stalking a crew member Nargis.
Nargis felt that Akshay was saying the truth and headed straight to Neeraj Pandey (Director of Baby) to complain.
(Naturally) Pandey confronted Karan who went into a tizzy. But Akshay was not done yet!
A few hours later, the Oh My God! actor took the prank to yet another level. A source says, "Akshay stuck a paper on Karan's back which read: I love you, Nargis."
The drama took a new turn when some crew members asked Nargis to look at Karan's back.
At this point, the crew members present on the set burst into laughter.
The Baby villain couldn't believe his ears when he was informed that it was Akshay who had played the joke on him.
When contacted, Karan simply said, "Akshay is a fun person to be with."