BHM - that's really funny! It does remind me of an incident when my ds was actually potty training, so he was nappy-less, and had an 'incident' on the carpet. He turned and realised what he'd done, exclaiming "Poo fell out!"
If Jackson is aware every time he 'goes', or goes to a special place to do it, or better still, tells you that he's 'gone', or tells you if you ask him, then maybe it's time to start thinking about potty training.
Personally speaking, I found potty training ds a complete doddle compared to establishing bf or weaning. In fact, I actually quite enjoyed it because it went easily. There, I've gone and jinxed myself - dd's gonna be a potty training nightmare now!
I'd take it slowly, BHM. You could get a few books about it (for you to read to him). 'Once upon a potty' is good, if a bit americanised - just insert your own words. 'Everybody Poos ' as well, can't remember what others we had. There's a toilet-themed episode of Bear in the Big Blue house, too. Start with those. Maybe buy a couple of potties, one for him and one for his favourite toy, to get him used to seeing them Some people start on the toilet straight away, but it's better physiologically for a child to have their feet on solid ground, or at least something solid.
When you think the time is right, sit him on the potty with a nappy on regularly after meals and read to him. Gets him used to sitting on it for a long enough time. If you feel he's ready, maybe suggest one day to sit with nappy off, reading. If you get a result, show him what he's done, and give lots of praise. After several results in a row he might make the connection, at which point you could start potty training seriously - you need to be consistent - no nappy, sit him even more regularly, ask him if he needs the potty, praise for each result, and if he was truly ready for it, he'll start running to the potty just before he needs it!
There endeth the sermon.