Concentration.

We were in the park, where Isabella, was tying me to a swing.

She and Mia were Police Officers, and they were putting me in jail.  Only problem, I kept escaping, and running off.

I kept thinking of Benny Hill's music, as I raced across the park, with 2 little people chasing me, screaming with laughter.  We played this for ages.

It's amazing that such simple games keep them so occupied.