Neutrino

Bartender: We don't get many neutrinos around here.

A neutrino walks into a bar.

Link. Seems like people have been trying to figure out all day the right way to tell that joke.  At this rate, it will be old before it is funny.  Which probably figures.

I met a neutrino named Flyte.
Which traveled much faster than light.

It departed one day
In the usual way

And arrived on the previous night.