Mumbai: Actress Richa Chadha has apologised for joking about a person’s “bipolar” condition last year, saying she now understands what mental health means. “I think last year I made a joke about someone being ‘bipolar’. The joke was borne out of a petulant desire to seem witty in even less than 280 characters. As I am now only beginning to grasp what mental health means, I just want to apologise and couldn’t have said this sooner,” she tweeted on Monday. Netizens lauded the actress for her honest confession.