Random memory: I remember reading in The Beano about celebrities who were members of the Dennis the Menace Fan Club, and it went on to mention Jimmy Krankie and Mark Hamill. While Jimmy Krankie would wear the fan club badge when he/she appeared on Crackerjack and the like, Mark Hamill did not wear the badge in the Star Wars films. The reason given was that he was worried about the pin puncturing his space suit.

I remember being annoyed at this because there is no point in Star Wars where Luke Skywalker wears a space suit.