Alright /bant/, I see you've been talking about it again so it's time to set the record straight.
If I did do it, then I surely did it. If I did do it but I didn't do it, then I couldn't have done it, could I? Now, if I did do it yet I did not do it, then I did not do it. If I did do it and I actually did do it, then I did it.
Thank you.