Hiya Rog
It depends what you mean by special...
I can remember crying all the way through playing one particular song whose words were particularly poignant at that time...
On another occasion I'd done a slight amount of damage unwittingly to my keyboard such that the right hand was half a tone higher than the rhythm key!!!
Interesting life playing the keyboard at times isn't it though - all sorts of people come up and thank you for bringing back memories for them.