Leslie said:
Yes, they're that stupid!!!!!
No, they're not stupid. They're boys.
And instead of blowing up at them, you should, perhaps, suggest that next time they want to experiment, that they have an adult supervise. They're curious. And they will try stuff. You need to try to get them to include you instead of avoid you. Guidance always works better than punishment.
Then remind them that water + electricity = funeral costs, and burnt down houses.
Oh, and I'm taking some of my own medicine. Last week, I talked to V2.0 about getting her period. Fun fun.