How to be a Complete Bastard is a 1986 book by Adrian Edmondson, Mark Leigh and Mike Lepine.
The book was a spin-off from Adrian Edmondson's character Vyvyan in The Young Ones, and contained a selection of ways to be a "complete bastard" to those around you. Some examples are:
It was followed up with The Complete Bastard's Book of the Worst in 1989.
The book was also turned into a video game for ZX Spectrum,Amstrad CPC and Commodore 64, as well as a board game published by Paul Lamond Games Ltd.