mom i'm pooping in my pants!

on wed. i took mason to the library and he was fascinated with the self flushing toilets in the bathroom so he kept telling me he had to poop, so i would take him to the bathroom and he would just wave his hand by the toilet watch it flush and then tell me he was done....he did this 3 times and finally i told him i wasn't going to take him in there again....so then he yells "mom i'm pooping in my pants" he bent over and said look in my pants mom i'm really pooping...i dropped my books and ran with him into the bathroom, i was sooooo embarassed!