I don't think you were too harsh. Your rule was "don't touch the stove" they disregarded it, then giggled about it. They proved that they were not trustworthy, and they sufferred the consequences. Nuff said.
I think you are a little paranoid about the stove. I have certainly let my kids, at that age, turn on and set the temperature (with supervision, of course) and the safety goggles thing is REALLY excessive. (I'm an ER nurse, and trust me I have never seen anything like that. Truly a one in a million)
But:
YOUR RULES ARE YOUR RULES. Your kids need to know that there are consequences to actions.
On a side note:
I am also very strict. My 11 y/o was punished from video games for not doing her homework. She took her Gb DS out of my desk and snuck it into her backpack, and took it to school....and got caught. I made her march it out to the trash and throw it and all the games in. (and, no, I did not retrieve them!) My $$$ paid for it and if I want to toss it I damn well will!
BTW, the safety goggles are only used when cooking with oil or grease that can splatter. Its just common sense to me, grease can splatter! Remember the story I heard from my ER nurse friends about the lady who had both eyes badly burned from grease splatters? You'd use safety goggles under other conditions that warrented them, such as using power tools, etc. I just want to state that I'm really not paranoid about the kitchen---I don't cook in an abestos suit
I would have thought throwing away the game boy and all the games a little excessive. But that's how you chose to handle it! I would have taken them away for awhile, then let her earn them back. But the point you made (and I'm sure she learned) is not to break rules and sneak behnid your back. I probaby would not have thrown them away, I might have sold them on Ebay! Certainly would bring more money than a cake mix!
but he may grow up to be the next great chef!
I waited to teach that though because kids can lose limbs/digits while the aggitater sp? is going.