My cichlids will chase a laser pointer around their tank. The first time, we were just playing with the kitty, and realized (on accident) that the fish would chase the pointer too. It's actually very fun to "play" with them.
Personally, I think that pets are to be played with. But many people on here do not consider their snakes to be "pets." It's a collection. Some types of snakes you can't handle. For instance, I wouldn't exactly consider a hot to be a pet. It's a specimen, an interest, a hobby. And therein lies the difference between pet owners and hobbyists. :shrugs: