How do little boys go pee?

Part of Zoie's nighttime routine is going to the bathroom after we brush our teeth. She is already in bed and Ty was reading her a story. I was in the bathroom, doing whatever and Vance pushs the potty seat that he only stands on to brush his teeth and wash his hands, over to the toilet, climbs up and sits there like he has to go pee. I ask "Do you have to go pee?" No respondance, just a binkie switch. He looks in the toilet & hops down. I am confused now. I ask again, take off his diaper, and put him up on the seat again. He doesn't really like it. So I ask again, nothing from Vance. So I put the diaper on him. But he climbs up again. So I take off the diaper and the pajama bottoms and he climbs up there with 2 binkies. I walk down the hall to get Ty. "Can you come show Vance how to pee?" I say. He just laughs. "Why?" "Well, he is acting like he needs to pee, but he just keeps climbing up and down. He rolls out of Zoie's bed as the while laughing at me. We walk down the hall to find Vance peed right on the potty seat and the floor. I was shocked! I was only gone about 30 seconds. Maybe he had stage fright with mom hangin' around,asking stupid questions like "do you have to pee?" I wonder how often this will happen now . . Guess I will need to start watching the clock and putting him on the toilet. What a big boy! Maybe I won't have to threaten to send him to kindergarten with a diaper, like my mom did with Paul along with other moms with little boys.