Some of Mrs Malprop's most famous sayings are present in this Act, and they are a hoot.

"…the ingenuity of your appearance"
"Ah! Few gentlemen, now-a-days, know how to value the ineffectual qualities in a woman!"
"He is the very pine-apple of politeness!"
"I exploded the affair; long ago I laid my positive conjunctions on her"
"I have since laid Sir Anthony's preposition before her"
"…resolved to decline every particle that I enjoin her."
"Oh! It gives me the hydrostatics to such a degree."
"I thought she had persisted from corresponding with him"
"I have interceded another letter from the fellow"
"Sure, if I reprehend any thing in this world it is the use of my oracular tongue, and a nice derangement of epitaphs!"
"She's as headstrong as an allegory on the banks of Nile."

I myself have used "the very pineapple of politeness" before to great acclaim, but I think that now I'll have to affect "Oh! It gives me the hydrostatics." ;-)