Bloopers and Behind The Scenes on Instagram: "Will & Grace outtakes are widely regarded as some of the funniest behind-the-scenes moments in sitcom history. The cast’s chemistry was so sharp that even the smallest line slip could trigger uncontrollable laughter. Debra Messing and Megan Mullally were especially notorious for breaking each other, often derailing entire scenes before they could even begin. Eric McCormack and Sean Hayes weren’t much better—once one of them cracked, the rest followed