When Jesus went up on a mountain with the apostles and there was a whole lot of lightning and shit...then Moses and Elijah and maybe some other dudes appeared and were talking with Jesus. Jesus was resplendent in light and the apostles wanted to stay and build booths there; kind of like Summerfest 30 A.D. In an instant it ended, and Jesus told the apostles not to tell of it until after the Resurrection. Observed as a Feast by the Catholic Church on August 6 and also commemorated each year on the Second Sunday of Lent.
