Like Graeme said sometimes they have their off days.
I caught Stanley a few years back,,, had nothing for him to autograph. But he was the coolest, calmest, nicest guy to meet.... unfortunately I was a bumbling wreck to be in his presence, I do not even remember what I said to him or he to me....
- note the deer in the headlights expression from me.
Yeah - that's when having long hair was important to me :-`