"A Matter of Perspective" - Data critiquing Picard's painting. I couldn't stop laughing, but even though Data was trying to be kind with his assessment, I felt bad for Picard. Data is one of the very few people, I think, whose opinions TRULY matter, to the point that we never see Picard paint again. It reminds me so much of the scene in "A PIECE OF THE ACTION" when Spock tells Kirk, as he parked the car, "You are an excellent starship commander, but your driving leaves much to be desired."