I wonder which producer had to muck out his stall

January 5, 1961 –
Mister Ed, the talking horse (with a daily diet was twenty pounds of hay, washed down with a gallon of sweet tea.,) debuted on CBS-TV on this date.

The horse wouldn’t respond to any of his co-stars, just his trainer, Lester Hilton. This meant that Hilton had to be on the set at all times, calling out commands or giving them with hand signals.