That joke is too high level for me.
Being a Dutchmen my German is infinitesimally better than the average Non-European, but I still have no idea what that's about.
Meh, don't really like the Lonely Island.
This is why I will never ever in my entire live understand the American grading system.
Good parents indeed.
It reminds me of my grandfather, he said: "You're a good grandson. Unlike my son you like mathematics and physics. In other words; the real sciences. Not the stupid chemistry my son adores so much"