The first man cannot guess surely so he may die... but if he blows up, the shrapnel will kill the second man. If this is the case, the third man doesn't know what color hate the second man has and thus has less of a chance of guessing correctly. If he guesses incorrectly then his bomb will go off and kill the fourth man. So basically... unless they stand far enough away from eachother they are fucked anyway.

Il papa caca nei legno?