Recently some work done in association with CERN has suggested that Neutrinos might have been observed traveling faster than light (See: The Guardian, 22nd September 2011). Amongst other things, this tends to turn the whole idea of causality - or cause and effect - on its head. Hence, a geek joke currently doing the rounds goes:
The bartender says 'we don't serve neutrinos'.
A neutrino walks into a bar.
