Showbiz Story - Milton Berle

The late Uncle Milty (who I worked with on several occasions) was a perfectionist of sorts, but also had a substantial ego. And he had curious ways of making sure everyone knew how "expert" he was.
One of his tricks: Milty would walk into the band rehearsal, usually about 2 hours into the rehearsal, and stop the band in the middle of a particular number. (I don't remember which one it was now.) He would immediately point to the 3rd trumpet, and loudly announce that he had played a wrong note, and that the correct note at measure such-and-such was a B natural (or whatever - the exact note escapes me now). Sure enough, there was an error in the part, and the correct note was as specified by Uncle Milty. Pretty impressive - this guy really knows his own material!
Of course, it was a set-up. A year later, when I was playing the same show, and the same music, the same procedure took place. Scripted to the letter!
The chart was intentionally left with the mistake uncorrected so that Berle could demonstrate his command to all and sundry at the rehearsal.
Nice con job. And I think I may be one of the very few people that actually caught him at it. Other than his Music Director, who at the time was Leonard Sues, the trumpet player. He knew perfectly well what the scam was, but Berle paid him a lot, and he kept his mouth shut.