Actors Akshay Kumar, Suniel Shetty and Gulshan Grover on Wednesday turned nostalgic as their superhit comedy "Hera Pheri" completed 21 years of release.The Priyadarshan directorial had opened on March 31, 2000 and is counted among the greatest comedies ever made in Bollywood."No wonder we underestimate how quickly time flies. It seems I blinked, and 21 years went by. What a film we made @priyadarshandir @akshaykumar @SirPareshRawal @GulshanGroverGG Tabu. Missing OmPuri ji very dearly today," Suniel Shetty tweeted.Commenting on Suniel39s tweet, Akshay Kumar wrote: "Agreed! Even we didn39t know back then what a film we were making, each scene better than the other. Specially love this one: dhoti. Genius of Priyan sir and epic dialogues by late Neeraj Vora."Actor Gulshan Grover, who was also a part of the cast, tweeted: "21 years of Herapheri , what a film by director Priyadarshan @priyadarshandir Producer firozNadiadwala and brilliant actors @akshaykumar @SunielVShetty @SirPareshRawal Tabu Asrani ji , late OmPuri ji and KabiraSpeaking.""Hera Pheri" was followed by a sequel titled "Phir Hera Pheri" in 2006, and talk of a third film in the series keeps happening off and on. On Wednesday, commenting on the actors39 tweets, fans demanded a third installment in the franchise should be made.