A pair of accountants go camping one weekend. They pitch a tent near a lovely river bed and settle down to relax. When darkness falls, a loud roar is heard coming from the nearby forest. "What's that?" asks the first accountant. "Ah, its just the sounds of nature. Relax" says the other. A few minutes later the same sound is heard followed by a high pitched voice. The first accountant, feeling nervous, does a bolt out of his tent with a flashlight to investigate the strange goings on. After half an hour, he returns. "So what was it?" asked the other accountant. "It was one of my clients. They had just received my bill."