Whenever my never ending refit gets me down. Which is usually whenever I get in a fight with the person who lives on the other settee over who got the sawdust/fiberglass or paint chips in the other's bed/clothes.
I browse yachtworld and look at other boats. 90% of the time I see boats with more worn out parts, or spot a dozen things I'd have to fix and console myself that at least I'm not fixing that boat.
If that fails I'll open the cabinets and look at my sink drain, which I'm very proud of right now.
Took me 6 tries to get my sink drain just right, but now it's RIGHT. Maybe not on par with building a boat from scratch, but probably fairly close.
Whoever thought a 1 1/2" sink drain 9" above a 1 1/4" throughhull was a good idea should be keelhauled.