You are the maker, you have the idea. For instance: thrown away bananas return as boomerangs!
A fancy idea for a commercial often consists of one information to which another information is linked that allows us to see the first information surprisingly differently, and then abruptly reveals the message of the commercial.
Stories in which someone solves a problem and / or somehow gets into trouble are always grateful. But in advertisement, in particular, everything is possible, sometimes it is only the font or only a picture that makes it happen.
Basically, there is only one commandment: You shall not bore!
Do something that your audience won’t easily forget!