This week mine was homemade soda. Fermented sodas, citric acid + bicarbonate sodas, different juices and flavors like lime + lemon + cherry and pomegranate or mango peach or cola (homemade knock off)
This week I decided I was going to re-create the shared spreadsheet to my investment club portfolio, which quickly turned into writing a Python investment tracker
I've lost several nights to writing it so far, but it feels a little at the brink of disinterest now. There's only like a 5% chance I finish either the spreadsheet or the tracker at this point
--UPDATE--
I'm moved on to researching how car infotainment systems work and if it's possible to make your own. Guess it's just one of those weeks.