Why did my cat try to attack me?

Today I was in bed and my cat came and laid on me, kneading me. I was watching tv, petting him when I noticed him jerk towards me. I stopped petting him cuz he alarmed me and was still on me. Then he started meowing in a pitch I've never heard him meow before, over and over. He was trying really hard to get to my face so I sat up and used the blanket as a wall. He was going every which way meowing, trying to get to my face. My other cat came in the room to see what was going on. Then when he saw her, he stopped trying to bite my face and jumped down and started biting her. I had to split them up and put him outside. He's about 9 months old, we've had him for 7 months. He's not neutered so I let him out at night so he doesn't go crazy. He's very very cuddly. Has never bit or scratched me ever. I can't think he has petting aggression cuz I pet him all the time, and from what I read, seems like once you stop petting, they calm back down. Not being adament about biting their face. Also, when he was trying to bite my face he wasn't acting like an angry or aggressive cat. His ears weren't back, his tail wasn't twitching, he wasn't growling or hissing. Besides the weird meow, it was almost like he confused my face for ham the way he was trying to get it and because he didn't look aggressive. Hope someone knows what that was all about. Since he's not neutered he meows alot at me (not a new thing though, been doing this at least 2-3 months). Now everytime he comes at me meowing I get freaked out. haha. Any ideas will be appreciated, thanks!