I know this isn't for everyone as it leads an element to goofyness to the game but I thought I would share.
My group is a group that really appreciates a strong story over fighting so I decided to take a risk by having a tavern broadcast via a crystal ball a bloodbowl match. My thought was that the players had just gone through a really grim adventure (eye for an eye) and this might provide a stark contrast. It went amazingly well as not only did my players find the game fascinating (5 of the 6 players know nothing about warhammer) but they went so far as to make bets on who would win the game.
Then of course the inevitable question came up. Why are orcs getting along with humans enough to play an organized sport? I knew that question had to be answered to make any sense or realism out of the situation. So I told my players that everyone is paid an incredible amount of gold to play. That pretty much was believed by my group and made sense, but had an unexpected result. The players briefly considered career changes to blood bowl players. LOL
So to stop that, I had about 5 players die during the course of the game which made them rethink their carreer change.
In the end I'm glad I added this element as a brief diversion from the seriousness of the runious powers and the grim world. I know it may be to goofy for some but I thought I'd share.