Some clever jokes

These are my favourite jokes from http://veryviral.com/21-jokes-so-clever-that-you-probably-wont-get-them-definitely-wont-get-them/ without the annoying photos!

René Descartes walks into a bar. Bartender asks if he wants anything. … René says, “I think not,” then disappears.

Sixteen sodium atoms walk into a bar… followed by Batman.  (it took me a while to get this one!)

An infinite number of mathematicians walk into a bar. The first orders a beer, the second orders half a beer, the third orders a quarter of a beer, and so on. … After the seventh order, the bartender pours two beers and says, “You fellas ought to know your limits.”

Pavlov is sitting at a bar, when all of the sudden the phone rings… Pavlov gasps, “Oh crap, I forgot to feed the dogs.”

Three logicians walk into a bar. The bartender asks, “Do all of you want a drink?”… The first logician says, “I don’t know.” The second logician says, “I don’t know.” The third logician says, “Yes!”

An MIT linguistics professor was lecturing his class the other day. “In English,” he said, “a double negative forms a positive. However, in some languages, such as Russian, a double negative remains a negative. … But there isn’t a single language, not one, in which a double positive can express a negative.” A voice from the back of the room piped up, “Yeah, right.”

I’m thinking about selling my theremin… I haven’t touched it in years.

What does the “B” in Benoit B. Mandelbrot stand for?… Benoit B. Mandelbrot.

What do you get when you cross a joke with a rhetorical question?