The chances are that someone you know is still trying their hand at day trading. It might be you. But even companies whose business it is to promote day trading are now warning that you are likely to lose money unless you can rein in your emotions.

Which allows me to use the most brilliant FT Money reader comment ever written: “I lost most of our money backing internet stocks 20-odd years ago, the children were young (and at private schools — ouch). When l told my wife, she asked if I’d lost the house (which we owned outright). l said, no, even l was not that stupid. She then laughed and said that it ‘doesn’t really matter much then’. I realised at that moment she was the best investment l was ever going to make and that was a totally emotional choice.”

Yes, some of the best decisions in life are made using our emotions. So, why doesn’t that apply to investing?