Sane.
Come home with a newly filled propane tank, get distracted by 17,000,000,000,000 things, remember that you were supposed to do something with that propane, then 30 mins alter have a flash of a thought (brain fart?) "hmmm, I'll be able to have carbonated water now, haven't had it in a while," then realize "WTF did I just think up and why?"