Trailer phrase

• "She walked off the street, into his life and stole his heart," for "Pretty Woman"
• Movie poster words
• "In space no one can hear you scream," for "Alien"
• Something funny in setting of gelatin
• Catchphrase
• Catchword; slogan
• "Just when you thought it was safe to go back in the water," e.g
• Identifying phrase

Wiktionary Word definitions in Wiktionary
n. 1 The punch line of a joke. 2 (context computing English) A pithy quote habitually appended to a signature, used as an advertising slogan, etc. 3 A line attached to a draft of cargo or a container to provide control and minimize pendulation of cargo ...