[kgwgk]

Your comment reminded me of Gamow's Mr. Tompkins in Wonderland. I don't know if he mentioned that in particular, but he discussed what relativistic effects would look like if the speed of light was 10 MPH.

http://www.arvindguptatoys.com/arvindgupta/tompkins.pdf

[danbruc]

There is also a free game, A Slower Speed of Light. [1]

[1] http://gamelab.mit.edu/games/a-slower-speed-of-light/