I saw those words on the sign in front of a local liberal church, and was momentarily confused about how to parse them correctly.
Analysis below the fold:
The interpretation which came to mind immediately was that "hate" was a verb and "boomerangs" a plural noun, making the whole construction a verb phrase:
But there's a more sensible interpretation-- "Hate boomerangs" is a complete declarative sentence, with "hate" as the subject:
(Trees drawn with phpSyntaxTree.)