I had that one as well. ;-) Here are some more I noted down:

Sir Anthony: "her brain's turned by reading."

Jack: "comfort may be endured after all."

Mrs Malaprop (breaking in on Lydia and Jack's arguing): "Come, we must interrupt your billing and cooing awhile."
Sir Anthony: "Zounds! Mrs Malaprop, this is the oddest billing and cooing I ever heard!"

Sir Lucius: "the quarrel is a very pretty quarrel as it stands; we should only spoil it by trying to explain it."