As an artist, as an actor, as a writer, you have to use what's personal to you. You have to be personal about your work; otherwise, it doesn't ring true.
“During 'Saturday Night Fever' at the end of the first act dance number I tried to perform a split-jump, only I can't do them so I ended up on my ass followed by the most unsightly backward roll out of it, followed by the cast falling over in laughter and a good portion of the audience too.”