Freddie,

I'm willing to bet that if someone called up and said are you free tonight do you fancy going out then you would go, unless you had something else planned. You wouldn't not go out just because you hadn't put it in your planner & you always watched a TV program at that time, which is what I suspect this thing is getting at.

One of my friends is like that and it drives me nuts, being more of a fly by the seat of my pants kind of a girl (guess that's why I ended up flat on my back trying to learn skate boarding on my 21st birthday )