Way before he invented salad, Sid Caesar was a pioneer of comedy on television. He was best known for starring in "Your Show of Shows," a weekly 90-minute sketch comedy show from the 50s performed in front of live TV that was the progenitor of shows like "Saturday Night Live." Mr. Caesar passed away this year, but his gifts endure. I had the good fortune of talking with him 20 years ago when he was on a radio call-in show. Not only was it a thrill (for me, not him), it was early exposure to the importance of having one's own perspective…