Growing up I've never wanted to disappoint him, so have only had a few minor rebellious incidents, the main one being staying up past bedtime and then him finding out and taking away my extension plug so I couldn't use any of my electronics in my room - I never did it again after that. I've always tried to get the best grades and be the best kid I could be. If I did anything unacceptable he'd have a quiet chat with me to make sure I understood exactly what it was I did wrong, and better ways of sorting out that situation in the future.
When I was 18 and at uni majority of the time I'd call 1/2 a week and those calls last anywhere from 2-6 hours - something I always got called weird about as the other girls used to comment 'are you seriously still chatting to your dad? I only phone my ma once a fortnight and that's an hour tops'. Obviously there were times I was busy and that would sometimes be once every 2-3 weeks.
Even now at 26 I can easily spend hours just chatting with him, any time I have a problem he's the first person I'd call. When we were still living together he'd be hanging in a room, just us, for 3-6 hours playing games, watching movies, watching series discussing plots or whether or not we liked the series. There's been many times dad's been playing a role playing game and I've just watched it while talking to him or vice versa. If one of us gets stuck sometimes the other would read the guide on gamefaqs and give hints to the person who is stuck.
I couldn't want a better dad than him, and although he never finished school, he's always done what he can to improve himself.