However, baseball-almanac.com claims it was Jim Maloney in a spring training game.
In spring training of 1968, Bench’s first full year, he was catching veteran Gerry Arrigo, whose fastball was growing dim as his career went on. Arrigo, though, was in love with that fastball and insisted on throwing it, ignoring Bench’s signs for breaking pitches.
Finally, after Arrigo shook off another call for a breaking pitch to throw his fastball, when he released the pitch, Bench removed his glove and caught the fastball barehanded.
That account states the it happened in a Spring Training game in 1968. It says Bench, essentially a rookie catcher with the Reds (26 games in '67), was getting ticked off at then eight-year veteran Jim Maloney for continuously shaking off the breaking balls Bench called for.
It alleges that Bench went to the mound and said "Your fastball's not popping," to which, Maloney hurled the mother of all expletives at Bench.