Isaac is in a full-on mimic stage, and it's so much fun. When we're watching football, he will say, "GO GO GO!" after Judah does, and he raises his hands in the air over his head if you say, "TOUCHDOWN!"
For some reason, this weekend, he was fixated on the word "hope." I think it must be in one of his books, because it came up a few times, and every time I said it, he would repeat it. Also, when I put him to bed, I always sing "Twinkle, Twinkle Little Star," and once I finish, he always says, "UP!" (I sing the last line: "... how I wonder what you are," and he says "up," which starts the next line the first time you say "how I wonder what you are. Goof.)
But he'll repeat the most random things and have us rolling on the floor, or, more often, turning our head away from him and trying to keep the cracking up quiet so we don't hurt his feelings.
I need to write down some more examples because I know this time is so fleeting -- and so entertaining.