Hey! What happened to those clay tablets that were moving at 1.000000000000000000000000000000000001 light speed?
(Actually, I worked through an example where the signal moved very slightly faster than lightspeed, but I thought the notation would be too hard to follow, so I came up with this conceptually clearer example. "One light year" and "four times lightspeed" and time differences of many days are concepts that are much easier to visualize than (1.0 - 0.67*epsilon)*c, or some such.)
There was this guy with a tachyon shotgun . . .