I made that same noise when I caught ours spraying water into the electric space heater. He's generally not stupid, but he apparently really enjoyed the sizzle sounds.
Discussion
We have a smart boy 😂
Ours is brilliant. But he still does things like stuff toilet paper down the bathroom sink drain...
My kids never did that! Twice they had a whole tp roll fallen into the toilet and once used a ton of paper, but that's it.
Dropping a steel straw down the tub drain is another story.