Maybe I'm nuts when posting this..
Here are some rules:
1. A poster gives some logic problems.
2. The poster below it posts his/her solution to the problem and posts a new one.
Hope this sell...
Here is a problem I found on Copi and Cohen's book Introduction to Logic, 11th Edition:
Socrates was a great philosopher. Therefore either Socrates was happily married or else he wasn't.
The argument above is valid.