Here's a fun game Jeff & Dustin play, where the buttons on Jeff's shirt turn into actual Buttons, and Dustin can push them to get a reaction. It's hard to tell who is having more fun! (but I think it's Dustin)
See the video here:
http://youtu.be/RoImnwPhJF0
Dustin is 19 months old in this video (taken Feb 19th, 2013)