Tonight, even after I mentioned the gate here on my blog, that little turkey took it down and got all the way down the stairs into the basement before I noticed. When he spotted me coming, he ran away, right over to the wood stove, which fascinates him. "Fah-duh." (Fire.)
Fortunately, he has a very good understanding of "hot" and won't touch it, but I still worry that he'll burn himself by falling and touching it accidentally.
The good news is that I've outwitted him. I've used a twist tie to secure the lever in place. And even then, I didn't twist it enough at first. He actually managed to undo the twist tie! Apparently I don't give that child enough credit. Well, the underestimation ends now.