How many plungers should one family own?

Our plunger to bathroom ratio is 1:3 which worked well for us in the past. However, now that we have a potty-trained 3 year old boy who seems to really like toilet paper, it is perhaps time to invest in at least one more plunger, bringing our ratio up to 2:3 and thus giving us better odds of having one on the same level of the house as the clogged toilet when its needed. I am not exaggerating... this is not for entertainment value, we have 3 toilets and all 3 of them had to be plunged today. It's as if Sanjay intentionally planned this attack on us... he timed the cloggings within hours of each other and managed to alternate floors so that we had to transport the plunger each and every time. Thus, I am looking into purchasing an additional plunger. In all my research... I realize that the reason we may have been having so much trouble clearing the debris is because we've been using a sink plunger in the toilet! Had no idea there existed more than one kind of plunger. That Wikipedia sure is genius!

Obviously the boy doesn't need to use this much toilet paper... but I think he likes to ball it up and drop it in, until virtually all the water is absorbed in the 2-ply sea of tissue. For some reason, this is fun for him. The same way he thinks it's fun, when I ask him to walk over to me, to go out of his way to make sure one of his steps lands on top of the vaccuum. And, when I ask him to sit down so I can help him with his shoes... he must jump in the air first. I don't think I'll ever understand toddler boys.

Anyway, there have been lectures in the past about his bathroom habits and specifically the amount of toilet paper used, but today he has strict rules... "from now on, you may only use 3 squares of toilet paper, that's it". So, he's been counting out the squares and I've been checking with him... not only are we clogging less toilets, but the boy is learning a little math, too.