It would have saved you a trip to the bathroom
As a child I had a pet Redback (my parents must have been crazy!) that used to live in a small vented container. She must have been pretty happy because she managed to find a fella and created quite a large family. The young spiders were separated into a seperate jar after they tried escaping from the container, cheeky buggers. Turns out they're super dominant, or just not fussy about food, because after a while there was only one spider left.
I don't remember what happened to it, or the mother spider, but I can honestly say that as a parent I won't be letting my kids do the same thing! I have no idea how my mum managed to cope with me as a child. I'm terrified of them now!