Logical Fallacies

What is a logical fallacy?

"The two courses I took at UF were not very interesting. I don't think its a good university."

I know the professor said the Bridges of Madison County was smarmy trash and lacked any artistic worth. But I still think he's wrong. After all, it was on the best-seller list for over 100 weeks.

My opponent raises a good point, but can we really trust him? I mean, he moved to this town only two years ago and everyone knows that his wife left him.

Charlie: I think we should put more money into schools. Quality public education is so important.

Bob: So you’re saying we should cut military spending and spend it instead on more spiral notebooks and crayons? I guess you want our country to be a weak, defenseless target for terrorists.