This is our third attempt and it seems that it's totally true when people say that you should wait until your child is ready (why, oh why do I insist on knowing better than everyone else??? Dear Pride, I hate you.)
We got Jonas back from a weekend with Mimi and Papa and got him in underwear and told him that if he could go pee-pee and poo-poo in the potty, we'd take him to see Cars 2 at the movies with his best friend Dylan. I don't actually think the reward helped though, as much as Jonas seemed to understand his body's cues for when he needed to go much better than the last time we tried (and failed.) It took him 3 days to finally get a poop in the potty (yuck, yuck, yuck), but when he did, with Allen and Clara's encouragement as well, we all celebrated and cheered and Jonas got a lollipop. :)
(We're going to see Cars 2 next Friday!)
... and totally unrelated, for his birthday, Jonas got these AWESOME stacking robots from Tawney.
Vanessa and I had more fun than he did, trying to conquer the "Ultimate Challenge" formation. (See second picture above? Woohoo!)