You loved it in the first trilogy? It makes a comeback in this one. You need to see all 7 dialogues involving ladders and stepladders across all games :
Case AJ-2: Examine the ladder in Meraktis Clinic - Garage
Case AJ-3: Examine the ladder in Lamiroir's Dressing Room
Case AJ-3: Examine the ladder on Stage
Case DD-2: Examine the air vent in the Fox Chamber on day 2 after Fulbright leaves the room
Case SoJ-3: In the Detention Center on Day 1, talk to Maya and choose One more thing
Case SoJ-5: Examine the golden airplane in Dr. Buff's study
Case SoJ-S: Examine the broken lantern in the Reception Hall