Those under the illusion that anniversaries are happy occasions should read the comments of Sir Alex Ferguson last week.
Instead of reflecting happily on two decades at Old Trafford, and before his team paid a fitting tribute with a glorious demolition of Portsmouth on Saturday, he launched an attack on detractors, real and imagined, saying: 'It is scandalous some people think I should retire. It is none of their business. It disgusts me people think this way. It should not be allowed.'