What's the smartest thing your snake has ever done?
First of all I don't think any snake is smart. They are a mass of instinctual reflexes.
However, that does not mean they can not learn. For the first 6 mo that I had my corn snake he would hide under a log in his cage whenever I came into the room. After a while he got used to me and now sits on top of the log and looks at me when I come in.
When I started feeding him I would tap on the glass. Now when I come in the room if I tap on the glass he zooms over to my side and starts climbing the wall. Thats when I hand him a mouse. If I hold it by the tail he will take it out of my hand without biting me. Hasn't missed yet. If I do not tap he just watches me from his log.
So smart? No. But can they learn? Absolutely.