Boys and Boogers

What is it about boys and boogers? Last night I caught Coleman digging in his nose with his thumb, then sticking his thumb in his mouth. I reminded him that we don't do that and he nodded that he understood. Shortly after we knelt down for family prayers and I admit, I peeked at him to make sure his eyes were closed (something we've been working on). There he was, with his thumb in his nose again, he snuck a peek at me to make sure MY eyes were closed and when he discovered he was home free, it went straight to his mouth! A couple of seconds later, he repeated the process while watching me to make sure he wouldn't get caught. After we said "amen" he closed his eyes and non-chalantly went on his way as if he hadn't just consumed his nasal waste. I repeat the question, what is it about boys and boogers???