Favorite memories (as I'm starting my usual post-season watch thru, these are slanted toward the early years):
Grissom and Warrick -- the end scene of "Evaluation Day" on the rollercoaster, 1st season
Catherine and Warrick -- the scene in the breakroom in "Bully For You", 2nd season
Nick and Warrick -- the entire B story in "Anonymous", 1st season
Sara and Warrick -- the scene in the boxing ring in "Fight Night", 3rd or 4th season
Greg and Warrick -- the scene in "Early Rollout", where Warrick shows Greg how his equipment should be organized, 4th season