Nastiness

So I know that everyone may not want to hear this story but here goes:
Last night I was giving Jonas a bath in the bathtub and sinceI like to soak up the hot water because it makes my back feel better while I am pregnant I climbed in with him. About half way through the bath I smelled something stinky but thought to myself I didn't see any bubbles come from him. So anyhow I proceeded with the bath teaching Jonas how to scrub his body with a sponge while he practiced scrubbing mine. He spent more time hiding the sponge in his crouch then he did wanting to try. Anyhow about five minutes pass of me trying to show him and him practicing when I notice something brown float by. It is then that I immediately pick him up from his safety chair and notice what I had been dreading he had a bowel movement in the bathtub, immediately after lifting him up it all starts to float closer to me . I yell for Ben who is on the phone with someone he comes in upset that I am yelling for while he is on the phone until I tell him about the predicament which he then proceeds to laugh. Unfortunately I was given the task of cleaning it all up while Ben put Jonas down for bed.
This situation wouold have upset me a lot more but since Jonas I have learned to a laugh at this and just think why me?