Things have a nasty 'habit of not turning out' the way you expect them to. [=things often do not turn out the way you expect them to]
He reached into his pocket for his keys 'by/from force of habit'. [=he did it without thinking because it is what he usually does]
I'm 'not in the habit of' making predictions, but I don't think there's much doubt about who will win this election.
(..) air intakes... when you talk and I find it weird... - I did it again. - Did I? Sorry, there is... it's a habit... maybe I picked it up from you. It's not like you need oxygen or anything. I guess that... I was trying to communicate... (..)2013 Her