This was one of my favorites: (Gavin Creel) : Recently in Hair, I totally blanked on the entire second verse in "The Flesh Failures" at the end of the show. I finished the first verse and froze. I had no idea what the words were, so I just walked forward in silence with my arms out. Will started screaming out "CLAUDE!!!" to try and fill space but I just kept walking... in silence... Megan Lawrence told me afterwards that that is called going into "the white room." I don't like the white room. (First time I've heard of the term "the white room."
"Noel [Coward] and I were in Paris once. Adjoining rooms, of course. One night, I felt mischievous, so I knocked on Noel's door, and he asked, 'Who is it?' I lowered my voice and said 'Hotel detective. Have you got a gentleman in your room?' He answered, 'Just a minute, I'll ask him.'" (Beatrice Lillie)