I agree with The Man Who Came to Dinner. Also loved Run For Your Wife and its sequel, Caught it the Net, although those involves more physical comedy. And you can never go wrong with The Importance of Being Ernest.
"I haven't got a pail."
"Find your grail, your GRAIL!"
"But it's not missing. It's right on the counter where it's supposed to- defying gravity, my giant cup's gone!"
"Five hundred, twenty-five thousand, six hundred minutes. How do you measure... measure a year?"
"How many times do I have to tell you, it's five hundred twenty-five thousand, five hundred and eighty-five point thirty-two minutes. You will never graduate if you keep basing your math on showtunes."
"You ruin Broadway for me."
"As well I should."