What do puppets do when they are not bringing joy to children?

According to “The Happytime Murders,” a movie starring Melissa McCarthy in which puppets and humans inhabit the same world, the lovable characters get involved in sex, drugs and even murder.

It is not the movie’s raunchy depiction of puppets prostituting themselves, cursing or blowing their heads off that caused Sesame Workshop, the educational nonprofit that produces “Sesame Street,” to file a lawsuit against the film’s creators, STX Entertainment.

It is the use of the tagline “No Sesame. All Street.” in its promotions that tarnishes a brand beloved by millions of children for nearly 50 years, the lawsuit claims.

“We take no issue with the creative freedom of the filmmakers and their right to make and promote this movie, rather this is about how our name is being misused to market a film with which we have no association,” Sesame Workshop said in a statement.