It's [Prokofiev's American Overture] scored for a chamber battery of winds, brass, and percussion, plus two double-basses and a cello. MTT came out on stage, looked around as if in puzzlement as to who he was supposed to shake hands with in the absence of a concertmaster, and chose the cellist.

I once saw Professor Peter Schickele do the exact same schtick at a P.D.Q. Bach concert; since there was a trumpet player sitting in what would have been the concertmaster's chair, he shook hands with the trumpet player.