One horse drank but the other one just stood there.

Pap said, "Did you ever hear the quotation that you can lead a horse to water but you can't make him drink. Well watch this."

He took a small amount of fertilizer and threw it in the horses mouth.

The horse immediately began to drink. Then my grandfather said. "You can lead a horse to water and if you want him to drink, put a little salt in his oats."