How can I get my friend to talk to me again?

Same exact thing with my friend! I dunno, he seems on crack or something, but who am I to say that…We were sitting up in a tree and I realized a bird nest with an egg in it. I told him I was gonna try to get the egg for breakfast. He laughed and tried to get it himself. He climbed up to the branch it was on and shook it. The egg came tumbing down to the ground and broke. I said he was an idiot for breaking the egg, and he said he’d snap my leg if I didn’t shut up. I told him that my leg could kick him out of the tree. He said yeah right and I asked if he wanted to test that theory. Then he became silent so I jumped out of the tree and went inside for a drink. He left before I even knew why he left. We get into fights all the time, but he never did that until now. I saw him the next day by my neighbor’s house. He ran past me as if he didn’t want me to see him and went inside to hang out with the dude in his room. He just acts all weird now and tries to avoid me and stuff, it’s kinda crazy how we walk by each other and he doesn’t say anything except a mumble to himself that sounds like, “Just keep walking”. I try to say hi, but insead, he runs away. He seems afraid or something, oh yeah, I dunno how to solve your problem though, just don’t let your parents get into it. They make it worse…