Some visual evidence.

I finally caught him.  I've tried to before, but as soon as he sees me he pulls his fingers out of his mouth.  He was playing on his tummy and kept rolling over.  I kept rolling him back to his tummy.  I went to get dressed when I noticed he was being very quiet.  He had fallen asleep in the floor...after he rolled over for the last time.

Does this look familiar to anyone?  I promise this isn't staged at ALL.  I started putting his clothes on him when he stirred and stuck these two fingers in his mouth.  I used to suck on these fingers when I was little.