We have a few Mrs. Malaprops clones in our office - the worst is our (not mourned) former big boss, but there are lots of others who are moderately educated but like to use big words to 'sound smart' - not that using inappropriate or even large words does make you sound more intelligent, but whatever floats their boat.
There are a couple of things that keep going around, incorrectly, and being repeated. Someone told someone that the word 'magnanimous' was the same as 'enormous' - I think they were going for magnificent and enormous and stumbled on a portmanteau that IS a real word with a different meaning. The usage is "Since we have such a magnanimous work load this week...." I keep picturing a beaming pile of files holding out a hand or something... it's all I can do not to giggle. I'm a word geek, and am wont to use large words if they are appropriate - but I don't use words unless I'm SURE of the meaning.
My etiquette question is twofold - one, do you say something when you hear it used wrong? Should you try to use the correct word, or use the word in the correct context so they can hear the error? the second question (and I admit, the more fun part of the assignment) - what other badly misused words have you heard?