Snake
There is an insect on the roof in a spoon. It's there for the eating, and it's how you plan to attract a snake to your roof.
Snakes love insects, especially when they're ready to eat on a spoon. But, snakes don't usually go on top of the roof, so that's why you have to tempt one with an insect in a spoon.
じゃ
へび
None
Why don't you just bring a snake up to the roof yourself? Because snakes are heavy (へび).
Especially big snakes. They're really, really hebi.