I understand how amazing that is! Maybe he'd got into a subconscious habit of saying "All done" not having gone and you just broke the routine?
Either way, it's a big milestone for your cutie-pie!
On a related subject I had to leave Archie in the car for 3 hours today and he held off going to the loo! Normally if he needs to go he'll need to go NOW but he held out for all that time and was then running out the back door to the garden as soon as we got in the front door! Yay! No messed up car.
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Yay!
Maybe he'd got into a subconscious habit of saying "All done" not having gone and you just broke the routine?
Yay! No messed up car. 
