Only twice, and they were intentionally back-to-back - this one we're posting on, and this one. That third time you're thinking of might have been the Marian apparition.
JESUS
"Engrossed in her usual chores at home last week, Mary Jo Coady’s eyes suddenly focused on, of all things, the underside of her household steam iron. And there it was."
MARY
"When the closet light hits the iron's metal just right, the reflection on a nearby wall bears an uncanny resemblance to the Virgin of Guadalupe."