Machshirin 3:6-7

Machshirin 3:6

If one’s olives were on the roof and rain fell on them, ki yutan applies if this pleases him. Rabbi Yehuda says that it’s impossible for a person not to be pleased by this. Rather, ki yutan applies if he stopped up the drainpipe (to prevent the rain from draining) or if he turned the olives in the water (to more effectively soak them).

Machshirin 3:7

Let’s say that donkey drivers were crossing a river and their sacks of grain fell in. If this pleases them, ki yutan applies. Rabbi Yehuda says that it’s impossible for a person not to be pleased by this. Rather, ki yutan applies if they rotated the sacks (to dampen them throughout). If one’s feet and the feet of his animal were muddy and he walked through a river, ki yutan applies if this pleases him. Rabbi Yehuda says that it’s impossible for a person not to be pleased by this. Rather, ki yutan doesn’t apply unless he stops to wash (the animal's feet). Ki yutan always applies to humans and to non-kosher domesticated animals.