Not touching

We were in a department store today, and Will kept touching the displays. After being asked nicely infinate times, I lost my patience and dragged him over to the pram, and made him hang on, with the instruction, again, that he was not to touch anything. He looked at me for a microsecond, then came out with...
..."except the floor, with my feet!" (grin) and then he started spinning his arms around next to me and saying "I'm touching the air too!"