An offensive penalty that occurs in its own end zone results in a safety scored for the defense (unless ABC orders that the penalty be treated as though it occured outside the end zone in order to prevent a blowout).
Doesn't that rule only apply in cases of intentional grounding?
Sadly that's not just ABC. Two of the things that drive me nuts in the NFL is how hard the refs try not to call intentional ground or safeties. If they can find any sorry excuse why a throw as actually a "pass" or why they shouldn't spot the ball in the wrong endzone they will. And extra good luck trying to get an intentional grounding call in the endzone, the refs have many volumes of excuses against that call.