A Roman walks into a bar, holds up two fingers, and says...

If you don't get this one, or if you don't have logicians as friends (count that as a blessing!), here's help (sort of):

http://languagelog.ldc.upenn.edu/nll/?p=3451

Some of the stuff here are also found in this link below:

http://higherperspectives.com/jokes-for-intellectuals/
 
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The funnies below are not "walk into a bar" ones...

And, finally...