The Simple Things-I know I shouldn't laugh...

I know that I shouldn't have laughed when Tristan showed me the food in his mouth-its really bad manners to do that-but he really caught me off guard. He was eating a mustard sandwich, which I thought was funny, so grabbed my camera to get a pic of it. I asked him to show me what he was eating and I assumed he would hold out the "sandwich." Instead he opened his mouth and REALLY showed me. He was really proud of himself for being so "funny." When did my toddler get a sense of humor?