Not really a roleplay, but close:
I gave my girlfriend the password to my computer, because I was not at home, and she needed to check her emails.
When I returned, I was unable to log in, and finally realised that she must have changed the password. When I asked her if she had done that (I couldn't believe it at first), she replied 'yes, you spend too much time at that stupid thing anyway. Spend some time with me instead.'
Then she refused to tell me the new password. I didn't know whether to be amused or angry. I knew she would tell eventually, but I decided to
persuade her to tell me.
We had a nice interrogation-game.
It took some time, and it involved a ruler, my belt, a riding crop (as I said before: she loves those evil things), handcuffs, ice cubes, tickling and lots of fun for both of us. I won't tell you in detail what persuaded her in the end. Well, it was not the spanking. I didn't want to overdo it because when she finally confessed, I told her I would spank her again later, because that was an extremely naughty thing to do. And of course I did. After I had tried her password and installed a brand new one.
Of course this was semi-serious, although I could see the playful elements and enjoyed it very much (she was right, by the way. I really do spend too much time in front of that machine

).
But afterwards she actually suggested to make this into a role-play some time, because she was really thrilled by it. I'm positive, we will. Maybe with some film noir setting. 50s style clothes, stuff like that. Yummy...