Day 73: My First "Photo Shoot"

I went to Wheeler Farm today with my sister and her kids. I wanted to practice taking pictures of people. Only problem was, they were very antsy. They just wanted to hurry and play, so I wasn't able to get too many. I was wondering if anyone out there has any suggestions to get kids laughing while taking their pictures. My nephew automatically says "cheese" and grits his teeth. When he's laughing though, he has a great smile.
I'll just keep practicing and make good use of the time the kids are willing to give me. :)