A man was doubting the real presence of Christ in the Eucharist. So he challenged St. Anthony of Padua, he challenged to have a donkey choose between two things, hay, or the Blessed Sacrament.
St. Anthony agreed to the man’s challenge. The hay was prepared, St. Anthony with fellow clergy, monks, and laymen processed outside the Church, and the donkey was put in place.
The man holding the hay offered it to the donkey, but instead, the donkey went towards St. Anthony, whom of which is holding the Blessed Sacrament up high.
And more than that, the donkey actually did something which appears as kneeling down towards the Blessed Sacrament.
The challenger, in awe, fell on his knees, and adored Christ in the Blessed Sacrament.