How did that get in his mouth?

Recently we saw on the video monitor Nicholas fussing a bit while laying in his crib with the pacifier about 6" away from his mouth. We are trying to let him learn to "soothe himself" so we kept watching him on the monitor. Next time I look he has the pacifier in his hand. A couple minutes later he was quiet so we look again and now the pacifier is in his mouth. So he must have grabbed it and put it back in his mouth. What confuses us though is...why does he take it out of his mouth with his hand in the first place?

He also enjoys putting his feet in his mouth!