Three teeth in one weekend!

My mother has been telling me for almost two weeks that she thinks Isaac is getting one of his top teeth. I'd never seen or felt anything. Until yesterday. He finished nursing, and he was laying across my lap. I was tickling and playing with him, and when he opened his mouth to laugh, I noticed something white in his top gums. His top right incisor has started to come in! I noticed later yesterday evening that the other top incisor is coming in, too. It's just barely broken skin, not too far behind the other one. That means he's getting three teeth all at once right now, and still no change in attitude or behavior. I think it's so weird. It's going to be even weirder when his adorable grin is punctuated by four equally adorable teeth. Oh, a side note: It appears as though the second bottom tooth coming in is coming in a little crooked.