When a simple task ends in a *face palm*...
My two players had the simple task of assassinating a minor official before he leaked their heretical plans to the inquisition. They had ample time and could do it in any subtle way. The players chose to spike the officials birthday cake at a banquet they were attending, the possessed cake ate the official just as everyone watched him blow out the candles!
To make matters worse they couldn't leave as witnesses and ended up being questioned by an inquisitor (played by me the GM) who ended up suspecting them of foul play after botched dice rolls to cover up and incriminate other guests. The inquisitor then kept trolling them with 'just one more thing...' questions and before you know it we had a 40k episode of Columbo!!!
Going to be honest, seeing someone get their face bitten off by a birthday cake would be freaking terrifying. I hope -everyone- gained insanity points there.