http://dice-corner-of-shame.tumblr.com/ ,
http://shamethedice.tumblr.com/, etc.
And you know, my first thought was to laugh, but last night my d20 kept giving me crap rolls and finally I put it in a container for a time-out (in fact, a party joke is that that set of dice is curséd) and threatened it with said shaming if it didn't behave.
Five dead and three wounded enemies later I think it proves it learned it's lesson.
So yeah. Dice shaming is not only a thing, it might actually work.