On Monday, the discussion on the non-supply of coarse variety of rice at Rs 2 per kg in public distribution system outlets had just ended and members of the Tamil Maanila Congress and a few other opposition parties who had walked out crowded the lobby. When the power link snapped, a few whistles could be heard in the lobby. A visibly irritated Speaker P T R Palanivelrajan said, ``Members who have walked out must conduct themselves with dignity.''