This should have been on a Grateful Dead album cover.
Perhaps it would have been, had Jose Pulido drawn it about 40 years earlier. It was part of a post about the "Cinco de Biko" post on Roof Pig!, a seemingly-dormant blog.
The image seems more appropriate to Dia de los Muertos (Day of the Dead), but it somehow seems fitting for a ride on this day, Cinco de Mayo.
Enjoy your "Cinco de Biko," whatever it is!