i had someone knock on the door the other night asking money for the deaf - he said it costs thousands each week to run, and did I have a spare couple of grand - the reply was 'if I did, it woudl have been given to the charity I volunteer for!! Didn't stop him for long though, but when he asked if I had any spare money, he got told 'sorry, no, I already give to 3 charities a month.' (although technically 5 if you include fostering!!) at which he finally gave up!!