I don't know if this helps, but you could adapt it. My joke goes like this.
A new manager is about to take over a business, when the previous manager gives him 3 envelopes and said �if you get into trouble please use these and they might help you through�. Thinking that he did not need any advice the new manager put the envelopes in the draw of his desk.
The business was running smoothly and profit was good, until 3 months down the line when things started to go wrong. He remembered the envelopes and decided to open one of them. It said �BLAME EVERYTHING ON YOUR PREDECESSOR�, so that�s what he did, and his bosses were happy and the business turned round and everything was running smoothly again.
6 months down the line and another turn around for the business, sales dried up and his bosses were getting on his back. Again he remembered the envelopes left by his predecessor, so he opened the second envelope. �REORGANISE� it said, so that�s what he did and again the business started to turn for the better.
Another 6 months past when business tried up again and his bosses began to ask questions. Again he remembered the envelopes so he opened the third one. It said �PREPARE 3 ENVELOPES�