There's a famous joke amongst physiologists, to do with drugs and neurotransmitters
[wow... must be dead funny then]
Well, what you do, you see, is you go up to someone. And you ask them... you ask them...
[laughter starts, gently at first but rising in a crescendo along the telling of the joke]
You say, 'What comes in crates and makes you paralytic?'
[we know exactly what he wants us to say]
Well?
[how long can we drag this out? Hmmm...]
Well, what most people would say is 'beer'!
[his laughter is heading fast towards climax]
You see, beer comes in crates. And if you were to drink a lot of it, you might exceed capacity. And that would make you...
...Paralytic!
[despite not having reached the punchline, Dr Tapp seems to have yet again reinvented the wheel of comedy and is well into his merriment]
But we physiologists. We think differently. You see, we know the answer is...
...Alpha Bungaro Toxin!
[Dr Tapp almost falls over with the force of his jollity. everyone still hasn't understood the punchline. they might check Keynes and Aidley later]