When I was 11, I waited outside my team's football ground for ages in the rain to get Billy Bremner's autograph.
When he finally arrived, I asked him politely for his autograph & he told me to ... "Go and f--- myself" ... !!!
(I had even called him "Mr Bremner" too! lol)
I laugh about it now, but only being a kid I was quite shocked at the time.
Bremner was a functional alcoholic for much of his life, and was known for being unpleasant and belligerent.