This guy was a guardsman for South African Railways for 50 years, so when his retirement came up, the railways built him a circular track and gave him a disused railway carriage in which to live as his retirement home. He was delighted. A few months later his ex boss decided to visit to see how he was enjoying his retirement. On arrival, he noticed the guy's wife grunting and puffing, pushing the carriage around the track. "What's up?", he asked the couple. "Well boss, after all these years in the Railways, don't you know that the toilets only work while the train is in motion?"