Sony's Lift Kara De will have Kajol as guest this week. And her good friend and director of her forthcoming film, Karan Johar will ensure her secrets coming out in the open! Apparently while shooting emotional scenes, Kajol relies more on her tear glands than the humble glycerine. She can have her eyes fill up at the drop of a hat and more amazingly whichever eye the director wants her to shed the tear from -- on cue! According to Karan, Kajol has never used glycerine till date and a director just needs to inform her a few minutes before shooting an emotional scene. Karan also said that it was trick that many actresses want to learn from Kajol, but she will never disclose it to anyone.