This is a first for us. Usually, if a site goes bad, it is because of blood in the cannula and we can see it up the tubing. Tonight we went to a friends for dinner. Yo was a bit high when we left. I'd corrected him, and gave him some hot dogs (I knew he wouldn't eat her food). While there, he had a couple of small pieces of bread, bites of steak, olives... nothing I'd consider carb loading! I bolused him for the bread and a bite of cake he'd had. He was so cross, I took him home early. Figured it was because it was late. Checked him "HI" ugh! Rechecked, checked ketones, bolused, added for ketones, rechecked in 40 minutes. He was down a bit, but not enough. No blood in the cannula! Set him up for a site change anyway. BTW, its a pretty new bottle of insulin, and he'd been sick, so running high, anyway. While doing the site change, I found the culprit!! The tubing had split off the part that twists onto the reservoir. He wasn't getting any of the insulin. It was squirting out the tubing. So, its been a long night. Diabetes. Blah!!!!!!!!!!!