I had piano lessons in primary school, but I eventually dropped out, because I hated practicing. Now, I only play when I feel like it, which is like once a year. I have a couple songs I can play, so every once in a while I figure out how to play them once again and when inspiration strikes and there is a new song I feel like I absolutely have to learn, I'll park myself in front of the piano and try it. It's usually soundtracks and stuff like that, as playing classical songs doesn't interest me at all.
Also, I've always sucked at reading notes, so I usually just do it once immediately learning the song by heart. Once I've played it a couple of times, I don't really know what on earth I'm even playing, aside from the first few notes. My hands seem to know what they're doing, though, so I just leave it to them.