There's an obscure play called "One Way Pendulum" that's absolutely absurd. A little too absurd, maybe...
"The Marriage of Figaro" and "The Barber of Seville" by Beaumarchais are hysterical (even after 300 years). Moliere can be funny, but it's rather high-brow and I have no idea how it translates into English.
Shakespeare can be funny but that's demanding for a monologue.
So yeah, there you go. Have fun!