A similar thing happened to me. At a Catholic Youth Conference a room full of young people were on their knees before the Blessed Sacrament. They were praying with one arm outstretched towards the Lord, present there on the altar.
Their next speaker was a Baptist pastor. He arrived early and came into the room and was aghast. “What is this? What’s going on?” he asked. He’d never seen Eucharistic adoration before. When it was explained to him he started weeping quietly and whispered through his tears, “It’s the most beautiful thing I’ve ever seen,” then fell to his knees and joined the young people in prayerful adoration.