5. “Before coming here tonight I was discussing my talk with my wife and she said to me:      ‘Don’t try to be too charming, too witty or too intellectual. Just be yourself.”

 - Ryan at Public Speaking Power

6. “Why did the chicken cross the Möbius strip? To get to the other… eh? Hang on…”

- David Colquhoun, professor of pharmacology, University College London

7. “After sex, one behaviourist turned to another behaviourist and said, “That was great        for you, but how was it for me?”

 - Charles Fernyhough, professor of psychology at the University of Durham

8. “How many Oxbridge dons does it take to change a lightbulb?”
    “Change!!!??”

 - Charles Fox

9. An electron and a positron go into a bar.
    Positron: "You're round."
    Electron: "Are you sure?"
    Positron: "I'm positive."

 - as heard on BBC Radio 4

10. “Three researchers - an engineer, a physicist and a mathematician are in a hotel for             an  international conference. Towards midnight the engineer wakes up and smells               smoke. He walks down the hall and sees a fire. Runs up to his room, fills the garbage         can with water and puts out the fire. Then he goes back to bed.

       An hour after the physicist wakes up and smells smoke. He opens the door of his               room and sees a fire in the lobby. He takes the anti-fire emergency pump and, after             calculating the speed of the flames, the distance, water pressure, trajectory, etc..,               extinguishes the fire with the least expenditure of energy and water. Then he goes               back to bed. An hour after the mathematician wakes up and smells smoke. He walks           down the hall, sees a fire and the fire extinguisher. He reflects a moment and then               exclaims: "Ah, a solution exists!". Then he goes back to sleep.”

 - Andrea Libbi