Colleague: "I've noticed you always start your requests on a negative? Why are you not positive? try staring with 'I know you'll have this, or You'll be able to do this."
Me: Sadly fifteen years of experience has taught me that I should expect a negative answer."
Colleague: "Well you'll be pleased to know that on this occasion your initial assessment was correct and I cannot get you out of the doggy doo doo."