A mistake in a scene in 2005 film Black is still weighing on Amitabh Bachchan's mind, which no one noticed. Now he wants the audience to identify that mistake and inform him. "For the 'River to River' festival in Florence recently, the choice of the opening film was 'Black'. I sat through it, and at every fault that I discovered in my work, I looked about to see if those that saw it with me saw it too...," the 70-year-old posted on his blog srbachchan.tumblr.com.

"The error that you notice remains, and bothers... but alas nothing can be done with it," he further posted. Directed by Sanjay Leela Bhansali, Black revolves around a blind and deaf girl, played by Rani Mukerji, and her relationship with her teacher, played by Big B, who later develops Alzheimer's. "I made a horrible error on the dining table scene in 'Black' and it haunts me till today. Though I am certain if asked none of you would be able to find out. Would you," wrote 70-year-old star, who played teacher Debraj Sahay in the film.