Naruto and Naruto Shippuden. ~started watching as a kid. I have so many fond memories of this show. I watched all of Naruto, but I'll admit I didn't watch to much of Shippuden. I was able to read a lot of it though. I love this anime so much.
Lee thought it would cool to wear a mask like Kakashi, and Guy is going berserk because he thinks Kakashi is trying to steal his protege from him. Kakashi thinks Guy is going Besek is funny, so he is going to continue teasing him for a bit more.