By your face

At church on Sunday Dallas needed to go get a drink of water. Since he's 5 now, I figured I could let him go by himself. Of course, I was a little concerned that when he walked back into the sanctuary, he wouldn't be able to find us, so I told him I would put something at the end of the aisle to see and he could find us that way. He went to get the water and when he came back, he says "I didn't need you to put that there, because I knew who you were because of your face"