It can be very hard to get them to cooperate when they are teething.
He kept putting his fingers in his mouth.
Then, you get lucky, and he smiles a bit for you...
And then he gives you another one.
Then, he finally decides to be nice and give you one of those I-just-want-to-eat-you-up-you-are-so-cute smiles...
And you decide to forgive him for being so ornery and you give him your last piece of chocolate.