The bath scene
When he goes into his submarine depressed state and goes in fully clothed. I remember doing that (even what I wore) about 10 years ago when I was a similar age. I don't think I was that unhappy because I remember my mum serving my dinner in the bathroom so she saw me do that (I even remember the meal...)
The key is to just use plain water, no bubbles. Have you submerged yourself in a tub fully clothed? If not, do you want to now?