I once gave kids white sandpaper and some licked it believing is in sugar.
There are also kids joking about "getting electrocuted". One told me that it was electrocuted by 3V piles I gave him. I said that he must throw away the smartphone, because it also runs on electric piles as well.:-) . He did not :-).
I dont know anything about wire nuts. Do you mean that their size is proportional to the number of wires? Looks logical, but the only reference I found was about the diameter of the wire.