Ernest Borgnine has been one of my favorite actors, since first seeing him on the 1960s tv comedy "McHale's Navy". It was some time later that I found out he was a seasoned actor and appeared in many movies before his tv series.
In 1980, I sent him a nice portrait photo to sign, and what did he do? He, or perhaps a secretary, used a rubber-stamped signature! And whoever did this, didn't even do it neatly. The photo, of course, is ruined now. I was disappointed by this, and never sent him another photo, thinking this would happen again.