Possible Clues:

• Microwave popcorn brand
• When Rosencrantz and Guildenstern are introduced
• Intermission follower, maybe
• When Hamlet says 'The play's the thing'
• Part of a play after intermission, maybe
• When the plot thickens, often
• When Jaques says, "All the world's a stage" in "As You Like It"
• When Polonius says "brevity is the soul of wit"
• In "Rent," it starts with "Seasons of Love"
• Popular microwave popcorn