My main hobby is music (for its aesthetic, not whatever topical "message" it might have).
However, I do like interrogating peoples' worldviews because often they have very strong opinions and like to pass harsh judgement on their interlocutors, while being totally unable to provide even the thinnest account for how and why they have any opinions or judgements at all. To that end, studying philosophy has been worthwhile to me.
Unassorted topics: