Corpsing . . .

. . . is an interesting term indigenous to the theeutuh.  It's when an actor on stage breaks up uncontrollably.  Often happens in Macbeth, according to the fellow on NPR, who said many superstitious actors won't even refer to the play by name, instead calling it "The Scottish Play."

The cited example is a howler:  this fellow's company of players gave a weekly matinee performance of The Scottish Play for the benefit of the elderly in the community.  The performance was in a theater so small that seating for the front row of patrons was practically on the stage itself.

One Wednesday, the teller of this story was within a foot of two sweet elderly ladies as he began the famous soliloquy that starts, "Tomorrow, and tomorrow, and tomorrow . . ." at which point one of the aged darlings leaned over to the other and loudly stage-whispered, "That would be Sat uh day!"  Considerable corpsing ensued.