Mine - Its not that great but whatever - I taught myself a language through song translation.
I was heavily into German Rock music while I was in highschool, and I would translate the non-English songs for fun, with google. By graduation, I was almost able to speak the language. Not fluently, but I got by from the people I knew who actively spoke the language.
Its been 6 years and Im not even interested in the music anymore, maybe from constant repetition of the same 4 albums over and over.
Anyway, Whats yours?
I taught myself car repair, plumbing, electrical, and wood working to name a few.
I made my kitchen table that our family sits at every night. I wired all the electricity in my 30x40 barn. I keep my 17 year old truck running (about to rebuild the transmission). I'm fixing the broken pvc pipe in my yard today.
Never pay someone to do something you can.