A famous one was given by the Harvard logician WVO Quine (look up Quine's paradox for more information):

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.    

When I first saw it I had to take a minute to parse what it was saying and why it wasn't self-referencing.  

Paradoxes without self-reference?
I'm looking for a Windows GUI tool to compare the contents of two folders and show which files are different....
