As long as People here are posting cerebral jokes...

[BlueJazz]

..anyone remember this one:

There was a young lady named "Bright"
Who could travel quite faster than light
She set out, one day, in a relative way
And came back the previous night.

[Mikimouse]

1. Well, technically, that's not a cerebral joke...

it is most probably an oblongatal joke.:+

[BlueJazz]

2. True..but the only other "oblong" one I knew or at least,

..had something Oblong in it was something about a Man from Mantuckit. :)