S6, E10: Opting out of the annual Adler Design Christmas party, ultimate "Fanilow" Will (Eric McCormack) spends the night waiting in line for tickets to a special Barry Manilow (as himself) concert - only to have his weak bladder force him to make a quick pit stop and entrust Grace (Debra Messing) to hold his place. However, Will's snubbing of an overweight man in the bathroom line leaves his chances of meeting his idol in doubt. Meanwhile, a distraught Grace discovers her mother (guest star Debbie Reynolds, "Singing in the Rain") has cancelled on their annual Hanukkah shopping spree to have dinner with Jack (Sean Hayes) and Karen (Megan Mullally) as they embrace the inspiring music of Manilow.