What not to do while potty training a 2 yo

Well after we went to M's Open house for school we got home and while the pizza's were in the oven I gave the kids a bath. While the tub was filling I got Zach undressed in his room. After taking off his diaper I asked him if he needed to go potty, he said no, then I proceeded to say I think we should try. So no sooner did I turn my back to throw away the previous diaper did I hear that oh so familar sound of a little boy peeing. I started to cry NOOOOOO Zach! He stoped turned towards me and gave me that look of "What?". I had to give it my all not to laugh it was very humorous. He had pretty good aim for such a young age. It was a very proud moment for him I do believe. So I rushed him to the potty and I don't think he did anything else. I called B's name and said I needed his help. He cleaned up the floor while I proceeded giving Zach his bath. Oh but I have truely learned my lesson. Don't ever ask a little boy if he has to go potty unless you are in the bathroom ready to put him on the toilet. Let this be a lesson to the rest of you.