For those of you don’t know who or what a Vegeta is, he is one of the main characters from the somewhat unknown anime Dragon Ball (ドラゴンボール). Japan knows where to feature their anime to grow its popularity, and that place is obvious.
On stamps (切手).
People have to use stamps. I’m not aware of any alternative way to send a message, so if you put Vegeta’s face (顔) all over stamps, people will see Vegeta. They will know Vegeta.
But Vegeta is a fighter. And fighters have to be fighting. So putting Vegeta by himself on an envelope (封筒) is just an insult (侮辱). He needs to face a proper opponent or the letter probably won’t be delivered to the correct address (住所).
And that can lead to only one obvious conclusion.
Now remember, the name Vegeta (ベジータ) comes from “ベジタブル” or “vegetable.” And what do rabbits (兎) eat?
Whoever got this letter in the mail.